Copier Z prints at a rate of 94 letters in every 2 minutes and Copier A prints at a rate of 136 letters in every 4 minutes. At 3 p.m., both copiers started printing. After a while, Copier Z stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier A continued printing during this time. At 5 p.m., the total number of letters printed during the past two hours was 7381. Express the number of letters printed by Copier Z 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 Z prints per min = 94 ÷ 2 = 47
Number of letters Copier A prints per min = 136 ÷ 4 = 34

From 3 p.m. to 5 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of letters printed by Copier A in 3 h
= 120 x 34
= 4080

Number of letters printed by Copier Z in 3 h
= 7381 - 4080
= 3301

Percentage of the number of letters that Copier Z printed over the total number of letters printed
= ³³⁰¹₇₃₈₁ x 100%
≈ 44.72%

Answer(s): 44.72%