Copier H prints at a rate of 85 letters in every 5 minutes and Copier J prints at a rate of 135 letters in every 5 minutes. At 2 p.m., both copiers started printing. After a while, Copier H stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier J continued printing during this time. At 4 p.m., the total number of letters printed during the past two hours was 8202. Express the number of letters printed by Copier H as a percentage of the total number of letters printed by both copiers. Round off your answer to 2 decimal places.
Number of letters Copier H prints per min = 85 ÷ 5 = 17
Number of letters Copier J prints per min = 135 ÷ 5 = 27

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

Number of letters printed by Copier J in 2 h
= 120 x 27
= 3240

Number of letters printed by Copier H in 2 h
= 8202 - 3240
= 4962

Percentage of the number of letters that Copier H printed over the total number of letters printed
= ⁴⁹⁶²₈₂₀₂ x 100%
≈ 60.50%

Answer(s): 60.50%