Question

If toffees are brought at the rate of 18 for a rupee, then how many of them must be sold for a rupee to gain 20 %

Answer 1

Given : toffees are brought at the rate of 18 for a rupee,  

To Find :  how many of them must be sold for a rupee to gain 20 %

Solution:

18  Toffee bought in  =  Rs 1  

=> 1 toffee bought in  1/18  Rs

Gain 20 %   =  (1/18)  + (20/100)(1/18)

=(1/18)1.2

= 1/15

1 toffee cold for  1/15 Rs

=> 15 toffee sold in  1 Rs

15 of them must be sold for a rupee to gain 20 %  

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Answer 2

Answer: 15 toffee sold for a rupee to gain 20%

Step-by-step explanation: Toffee are bough at the rate of 28

Solution- 18 toffees bough in Rs 1

1 toffee bought in $=\frac{1}{18}Rs$

Now Gain 20%

So $\frac{1}{18}+\frac{20}{100} \times \frac{1}{18}$

$=\frac{1}{18}+\frac{1}{90}$

$=\frac{5+1}{9} =\frac{1}{15}$

So, 1 toffee sold for Rs $\frac{1}{75}$

$15$ toffee sold in 1 Rs

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