Question

If the cost of 100 copies is $3.10, how many copies can be made for $155?

Answer 1

 Given that: 100 copies = $3.10

Find cost of 1 copy:
1 copy = $3.10 ÷ 100 = $0.031 

Find the cost of 155 copies: 
155 copies = $0.031 x 155 = $4.81 (nearest hundredth)

Answer: $4.81