Copier F prints at a rate of 84 brochures in every 3 minutes and Copier G prints at a rate of 136 brochures in every 4 minutes. At 8 p.m., both copiers started printing. After a while, Copier F stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier G continued printing during this time. At 10 p.m., the total number of brochures printed during the past two hours was 8947. Express the number of brochures printed by Copier F 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 F prints per min = 84 ÷ 3 = 28
Number of brochures Copier G prints per min = 136 ÷ 4 = 34

From 8 p.m. to 10 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of brochures printed by Copier G in 8 h
= 120 x 34
= 4080

Number of brochures printed by Copier F in 8 h
= 8947 - 4080
= 4867

Percentage of the number of brochures that Copier F printed over the total number of brochures printed
= ⁴⁸⁶⁷₈₉₄₇ x 100%
≈ 54.40%

Answer(s): 54.40%