Ramu gets Rs 10 from his friends. He gets the same money for 5 days. how much money does he have at the end?
 

Given:

Ramu gets $\mathrm{Rs}.10$ from his friends for $5 \mathrm{days}$

To Find:

The total amount of money he have at the end

Now, 

By adding the amount received in each day we get,

$10+10+10+10+10=50$

Or

Multiplication involves the repeated number of addition.

we get the same when we multiply the amount by the number of days.

$10\times 5=50$

Therefore, the correct option is A.