Pocket money

Ramesh had  X rupees on the first day of the month.

On every  Monday his  mother gives Rs. 10 as pocket money.

He spends half of what he had during that week.

On the  fourth  Monday  of the month also his mother gave his pocket money.

He counted all his money which amounts to 27 1/2  rupees.

How much money he had at the beginning of the month.?

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