Quantitative Aptitude Quest
Percentage
Every toy car costs three times as much to manufacture as a toy train. The manufacturer makes five times as many toy trains as toy cars. What is the percentage of the total manufacturing cost of toy car and toy trains
which is due to making toy cars?
1. 25
2. 37 1/2
3. 50
4. 75
Let C be the cost of making a toy car and N be the number of toy cars that are made. Then the cost of making a toy train is (1/3)C, and the number of toy trains made is 5N. So the total cost of making toy cars and toy trains is CN + (1/3)C(5N) = CN(1+5/3) = (8/3)CN. The cost of making the toy cars was CN so the percentage of cost for toy cars is CN/(8/3)CN) = 1/(8/3) = 3/8 = .375 - 37 1/2%