Xiaogang's mother spent 360 yuan on a sweater, accounting for 20% of the family's expenditure this month. 15% of Xiaogang's expenditure this month was for Xiaogang to buy books, and Xiaogang spent a lot of money on books How much did you pay?

Xiaogang's mother spent 360 yuan on a sweater, accounting for 20% of the family's expenditure this month. 15% of Xiaogang's expenditure this month was for Xiaogang to buy books, and Xiaogang spent a lot of money on books How much did you pay?

360 times 5 = 1800 times 0.15 equals 270