15. A machine is manufactured by assembling two parts A and B. If the price of part A increases by
10% and that of part B decreases by 10%, the cost of manufacturing the machine increases by 5%.
But if the price of part A decreases by 10% and that of part B increases by 10%, the cost decreases
by RS 200. Find the prices of the parts.
PLESE SOLVE STEP-BY-STEP CLEARLY......?
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Step-by-step explanation:
let price of part A be a, part B be b
a b
10% -10%
. .
. .
5%
. .
. .
5-(-10) 10 -5
15 5
a:b =15:5= 3:1
(3×(-10)+10) /4 =-20/4=-5%
5% is 200
100% is 4000
4 parts is 4000 => 1part is 1000
a is 3parts =3000
b is 1 part = 1000
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