Question

Sona got 80% out of 500. How many more marks are needed to secure 90%?

Answer 1

$marks \: obtained = \frac{80 \times 500}{100} = 80 \times 5 = 400$

Thus, Sona initially got to marks out of 500.

Similarly for 90% she must have scored,

$\frac{90 \times 500}{100} = 90 \times 5 = 450marks$

Hence, the difference in marks is 50.

Thus, Sona needed more 50 marks to secure 90%.