Copier S prints at a rate of 84 brochures in every 4 minutes and Copier T prints at a rate of 145 brochures in every 5 minutes. At 1 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 3 p.m., the total number of brochures printed during the past two hours was 7431. Express the number of brochures printed by Copier S as a percentage of the total number of brochures printed by both copiers. Round off your answer to 2 decimal places.
Number of brochures Copier S prints per min = 84 ÷ 4 = 21
Number of brochures Copier T prints per min = 145 ÷ 5 = 29

From 1 p.m. to 3 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of brochures printed by Copier T in 1 h
= 120 x 29
= 3480

Number of brochures printed by Copier S in 1 h
= 7431 - 3480
= 3951

Percentage of the number of brochures that Copier S printed over the total number of brochures printed
= ³⁹⁵¹₇₄₃₁ x 100%
≈ 53.17%

Answer(s): 53.17%