Copier R prints at a rate of 88 brochures in every 2 minutes and Copier S prints at a rate of 136 brochures in every 4 minutes. At 4 p.m., both copiers started printing. After a while, Copier R stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier S continued printing during this time. At 6 p.m., the total number of brochures printed during the past two hours was 8184. Express the number of brochures printed by Copier R 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 R prints per min = 88 ÷ 2 = 44
Number of brochures Copier S prints per min = 136 ÷ 4 = 34

From 4 p.m. to 6 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of brochures printed by Copier S in 4 h
= 120 x 34
= 4080

Number of brochures printed by Copier R in 4 h
= 8184 - 4080
= 4104

Percentage of the number of brochures that Copier R printed over the total number of brochures printed
= ⁴¹⁰⁴₈₁₈₄ x 100%
≈ 50.15%

Answer(s): 50.15%