Copier J prints at a rate of 80 flyers in every 4 minutes and Copier K prints at a rate of 128 flyers in every 4 minutes. At 2 p.m., both copiers started printing. After a while, Copier J stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier K continued printing during this time. At 4 p.m., the total number of flyers printed during the past two hours was 8786. Express the number of flyers printed by Copier J as a percentage of the total number of flyers printed by both copiers. Round off your answer to 2 decimal places.
Number of flyers Copier J prints per min = 80 ÷ 4 = 20
Number of flyers Copier K prints per min = 128 ÷ 4 = 32

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

Number of flyers printed by Copier K in 2 h
= 120 x 32
= 3840

Number of flyers printed by Copier J in 2 h
= 8786 - 3840
= 4946

Percentage of the number of flyers that Copier J printed over the total number of flyers printed
= ⁴⁹⁴⁶₈₇₈₆ x 100%
≈ 56.29%

Answer(s): 56.29%