Copier B prints at a rate of 80 brochures in every 5 minutes and Copier C prints at a rate of 136 brochures in every 4 minutes. At 7 p.m., both copiers started printing. After a while, Copier B stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier C continued printing during this time. At 9 p.m., the total number of brochures printed during the past two hours was 7619. Express the number of brochures printed by Copier B 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 B prints per min = 80 ÷ 5 = 16
Number of brochures Copier C prints per min = 136 ÷ 4 = 34

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

Number of brochures printed by Copier C in 7 h
= 120 x 34
= 4080

Number of brochures printed by Copier B in 7 h
= 7619 - 4080
= 3539

Percentage of the number of brochures that Copier B printed over the total number of brochures printed
= ³⁵³⁹₇₆₁₉ x 100%
≈ 46.45%

Answer(s): 46.45%