Make video solution of question number 22 only. First explanation of question and then step by step explanation of solution. Be creative and use animation for visualization ---Here is the extraction of the questions from the image:
**Question 15:**
In a straight contest, the loser got 42% votes and lost by 14400 votes. Find the total number of votes polled. If the total number of eligible voters was 1 lakh, find what percentage of voters did not vote.
**Question 16:**
Out of 8000 students, 60% were boys. If 80% of the boys and 90% of the girls passed the exam, find the number of students who failed.
**Question 17:**
On increasing the price of an article by 16%, it becomes ₹1479. What was its original price?
**Question 18:**
Pratibha reduced her weight by 15%. If now she weighs 59.5 kg, what was her earlier weight?
**Question 19:**
In a sale, a shop reduces all its prices by 15%. Calculate:
(i) the cost of an article which was originally priced at ₹400.
(ii) the original price of an article which was sold for ₹204.
**Question 20:**
A candidate who gets 36% marks in an examination fails by 24 marks but another candidate, who gets 43% marks, gets 18 more marks than the minimum pass marks. Find the maximum marks and the percentage of pass marks.
**Question 21:**
The sides of a rectangle are 20 cm and 15 cm. If each side is increased by 20%, find the percentage increase in the area.
**Question 22:**
Imran gives 1% of his monthly income to his two sons as pocket money. The elder son gets 80% of the total amount given and he spends 80% of his share. If he saves ₹60 per month, determine Imran's monthly income.
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Let's understand this pocket money problem step by step. Imran gives one percent of his monthly income to his two sons as pocket money. The elder son gets eighty percent of the total amount given and spends eighty percent of his share. If he saves sixty rupees per month, we need to find Imran's monthly income.
Now let's set up our variables step by step. First, let Imran's monthly income be I. Second, the total pocket money given to both sons is one percent of I, which equals zero point zero one times I. Third, the elder son gets eighty percent of the total pocket money, which is zero point eight times zero point zero one times I, simplifying to zero point zero zero eight times I.
Now let's calculate the elder son's savings. In step four, since he spends eighty percent of his share, he must save twenty percent of his share. In step five, his savings equal twenty percent of his share, which is zero point two times zero point zero zero eight times I, simplifying to zero point zero zero one six times I. We're given that he saves sixty rupees, so we can set up the equation: zero point zero zero one six times I equals sixty.
Now let's solve the equation step by step. We have zero point zero zero one six times I equals sixty. To solve for I, we divide both sides by zero point zero zero one six. Converting the decimal to a fraction, zero point zero zero one six equals sixteen over ten thousand. So I equals sixty times ten thousand over sixteen, which gives us six hundred thousand over sixteen. Dividing this out, we get I equals thirty seven thousand five hundred rupees. Therefore, Imran's monthly income is thirty seven thousand five hundred rupees.
Let's summarize our solution. We set up variables for Imran's income and the pocket money distribution. The elder son gets eighty percent of one percent of the income, which equals zero point zero zero eight times I. Since he saves twenty percent of his share, his savings equal zero point zero zero one six times I. Given that he saves sixty rupees, we solved the equation and found that Imran's monthly income is thirty seven thousand five hundred rupees.