How do i solve this problem?

Question

The grocery store sells 3 packages of biscuits for $1.35. At this rate, how much will 8 packages of biscuits cost?

Answer 1

3/1.35 = 8/?

3 * ? = 8 * 1/35

? = 8 *1.35/3 = 3.60

1 package cost 0.35 = 35 cents

8 of them cost $3.60