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?
A. 1 apple for $1.20
B. 6 apples for $3.40
C. 10 apples for $6.00
D. 13 apples for $8.20
To find out how much each apple costs, we divide the total cost by the number of apples: $2.40/4 = $0.60 per apple
Next, we'll multiply the cost per apple by the number of apples Ellen could buy next week: $0.60 x 13 = $ <<0.60*13=7.80>>7.80
So Ellen can buy 13 apples next week for $7.80, which means the answer is D. 13 apples for $8.20