PROBLEMA DE OPERACIONES COMBINADAS - CÁLCULO DEL TOTAL A PAGAR CON DESCUENTO

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Let's solve this combined operations problem step by step. Martina wants to buy school supplies. She needs 3 notebooks at 10 soles each, 2 pens at 5 soles each, and 1 ruler for 8 soles. Her mom gives her a 10 soles discount for buying everything together.