Copier K prints at a rate of 104 brochures in every 2 minutes and Copier L prints at a rate of 120 brochures in every 5 minutes. At 6 p.m., both copiers started printing. After a while, Copier K stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier L continued printing during this time. At 8 p.m., the total number of brochures printed during the past two hours was 7807. Express the number of brochures printed by Copier K 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 K prints per min = 104 ÷ 2 = 52
Number of brochures Copier L prints per min = 120 ÷ 5 = 24

From 6 p.m. to 8 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of brochures printed by Copier L in 6 h
= 120 x 24
= 2880

Number of brochures printed by Copier K in 6 h
= 7807 - 2880
= 4927

Percentage of the number of brochures that Copier K printed over the total number of brochures printed
= ⁴⁹²⁷₇₈₀₇ x 100%
≈ 63.11%

Answer(s): 63.11%