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Question

Alka spends $$90\%$$ of the money that she receives every month, and save $$Rs. 120$$. How much money does she monthly?


Solution

Let the total money be $$x$$
now, money she spend $$=\dfrac{90x}{100}$$
Money she shave $$=120$$
Now,
$$\Rightarrow \dfrac{90x}{100}+120=x$$
$$\Rightarrow x-\dfrac{90x}{100}=100$$
$$\Rightarrow \dfrac{10x}{100}=120$$
$$\Rightarrow x=\dfrac{120\times 100}{10}$$
         $$=1200$$
She earn $$1200.$$
 Hence, the answer is $$1200.$$


Mathematics

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