Questions & Answers

Question

Answers

A. 60

B. 70

C. 80

D. 90

Answer
Verified

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.

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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