After the Spring Festival, I bought 3 kilograms of grapes and 2 kilograms of apples. How much did it cost?
8+0.5×3-0.3×2)
=8+ 1.5-0.6
=8.9 (yuan),
(8.9×5-2 1×2)÷(3×5-7×2)
=44.5-42
=2.5 (yuan)
(2 1-2.5×7)÷5
=(2 1- 17.5)÷5
=3.5÷5
=0.7 (yuan),
A: The price of grapes and apples per kilogram is 2.5, 0.7 yuan;
So choose: a.