Last week, Ellen bought 4 apples for $2.40. This week she bought 9 apples for $5.40. If the cost per apple remains the same, how many apples could she buy next week?%0D%0A%0D%0AA. %0D%0A1 apple for $1.20%0D%0A%0D%0A%0D%0AB. %0D%0A6 apples for $3.40%0D%0A%0D%0A%0D%0AC. %0D%0A10 apples for $6.00%0D%0A%0D%0A%0D%0AD. %0D%0A13 apples for $8.20
To find out how much each apple costs, we can divide the total cost by the number of apples bought.
Last week, Ellen bought 4 apples for $2.40, so each apple cost $2.40 / 4 = $0.60.
This week, Ellen bought 9 apples for $5.40, so each apple still costs $5.40 / 9 = $0.60.
If the cost per apple remains the same, next week Ellen could buy $8.20 / $0.60 = 13 apples.
So, the answer is D. 13 apples for $8.20.