What is the percent increase in the price of the car?

Question

The cost of manufacturing a popular model car is made up of three items: cost of raw material, labour and overheads- in a year the cost of three items were in the ratio of 5:4:2 respectively, next year the cost of raw material rose by 10%, labour cost increased by 8% but overhead reduced by 5%.
What is the percent increase in the price of the car?

Answer 1

15.64%

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5:4:2 becomes (5+10%):(4+8%):(2-5%) = 5.5:4.32:1.9, increase in total from 11 to 12.72 which in percentage is 100%* (12.72-11)/11= 15.64%