Copier V prints at a rate of 84 letters in every 3 minutes and Copier W prints at a rate of 130 letters in every 5 minutes. At 2 p.m., both copiers started printing. After a while, Copier V stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier W continued printing during this time. At 4 p.m., the total number of letters printed during the past two hours was 7164. Express the number of letters printed by Copier V 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 V prints per min = 84 ÷ 3 = 28
Number of letters Copier W prints per min = 130 ÷ 5 = 26

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

Number of letters printed by Copier W in 2 h
= 120 x 26
= 3120

Number of letters printed by Copier V in 2 h
= 7164 - 3120
= 4044

Percentage of the number of letters that Copier V printed over the total number of letters printed
= ⁴⁰⁴⁴₇₁₆₄ x 100%
≈ 56.45%

Answer(s): 56.45%