Copier S prints at a rate of 108 leaflets in every 3 minutes and Copier T prints at a rate of 128 leaflets in every 4 minutes. At 7 p.m., both copiers started printing. After a while, Copier S stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier T continued printing during this time. At 9 p.m., the total number of leaflets printed during the past two hours was 6739. Express the number of leaflets printed by Copier S 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 S prints per min = 108 ÷ 3 = 36
Number of leaflets Copier T prints per min = 128 ÷ 4 = 32

From 7 p.m. to 9 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of leaflets printed by Copier T in 7 h
= 120 x 32
= 3840

Number of leaflets printed by Copier S in 7 h
= 6739 - 3840
= 2899

Percentage of the number of leaflets that Copier S printed over the total number of leaflets printed
= ²⁸⁹⁹₆₇₃₉ x 100%
≈ 43.02%

Answer(s): 43.02%