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Question
A man sells 12 articles for Rs. 80 gaining `33 1/3%`. Find the number of articles bought by the man for Rs. 90.
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Solution
S.P. of 12 articles = Rs.80,
Gain =`33 1/3%=100/3%`
C.P. =`100/((100+"Gain"))xx"S.P."`
`=100/(100+100/3)xx80=100/((300+100)/3)xx80`
`=100/(400/3)xx80=100xx3/400xx80="Rs."60`
Rs.60 is the cost of 12 articles
Rs. 1 is the cost of =`12/60` article
Rs.90 is the cost of =`12/60xx90`
`=1/5xx90=18`
Man can buy an article for Rs.90 = 18
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