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. 13 apples for $8.20 B. 6 apples for $3.40
C. 1 apple for $1.20
D. 10 apples for $6.00