Copier D prints at a rate of 95 leaflets in every 5 minutes and Copier E prints at a rate of 132 leaflets in every 6 minutes. At 8 p.m., both copiers started printing. After a while, Copier D stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier E continued printing during this time. At 10 p.m., the total number of leaflets printed during the past two hours was 8919. Express the number of leaflets printed by Copier D as a percentage of the total number of leaflets printed by both copiers. Round off your answer to 2 decimal places.
Number of leaflets Copier D prints per min = 95 ÷ 5 = 19
Number of leaflets Copier E prints per min = 132 ÷ 6 = 22

From 8 p.m. to 10 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of leaflets printed by Copier E in 8 h
= 120 x 22
= 2640

Number of leaflets printed by Copier D in 8 h
= 8919 - 2640
= 6279

Percentage of the number of leaflets that Copier D printed over the total number of leaflets printed
= ⁶²⁷⁹₈₉₁₉ x 100%
≈ 70.40%

Answer(s): 70.40%