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
The cost per apple is given by $2.40 / 4 = $0.60.
Therefore, Ellen could buy 10 apples next week for $0.60 * 10 = $6.00.
The correct answer is C. 10 apples for $6.00.