& By selling an article for 240, a ...
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& By selling an article for 240, a van incurs a loss of 10%. At what price should he sell it, so that he makes a profit of 20%? RRB NTPC (Phase 1) 2016 (1) * 264 (2) 288 (4) 320 (3) 300

11th - 12th Class
Maths
Solution
80
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( S P=₹ 240 ) Loss ( %=10 % ) ( frac{c-5 p}{c p} times 100=10 ) ( frac{c p-240}{c p}=0 cdot 1 ) ( c p-240=0.1 c p ) ( 0.9 c p=240 ) [ begin{aligned} c p &=frac{2400^{800}}{93}=frac{800}{9} R b end{aligned} ] New spli with profit of ( 20 % ) ( P %=frac{8 p-c p}{c p} times 100 ) ( begin{aligned} P % &=20=frac{8 p^{prime}-800 / 3}{800 / 3} times 100 & 20=frac{38 p^{prime}-800}{8} & 38 p^{prime}=160+800 &left.frac{38 p^{prime}=960}{mid s p^{prime}=₹ 320}right|_{1 /} text { option }-(4) end{aligned} )
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