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# 50% discount + 40% discount=-----discountA. 60B. 70C. 80D. 90  Hint-When two discounts are given make use of the formula of total discount.

Let x be the first discount =50%
Let y be the second discount=40%
The total discount is given by the formula $\begin{gathered} = \left( {x + y - \dfrac{{xy}}{{100}}} \right)\% \\ = \left( {50 + 40 - \dfrac{{2000}}{{100}}} \right)\% \\ \end{gathered}$
The total discount=$\left( {90 - \dfrac{{2000}}{{100}}} \right)\% = 70\%$
Therefore, we can write 50% discount + 40% discount=70% discount

Note: Do not add up the two given discounts directly ,always make use of the total discount formula when solving problems like these.
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