33. The price of an article is cut by 10%. To restore it to the former value, the new price must be increased by
a. 10%
b. $9\displaystyle\frac{1}{{11}}$%
c. $11\displaystyle\frac{1}{9}$%
d. 11%

Answer: C

Explanation:
Let original price = Rs.100
Then, new price = Rs.90
Increase on Rs.90=Rs.100
Increase % = $\left( {\displaystyle\frac{{10}}{{90}} \times 100} \right)$% $ = 11\displaystyle\frac{1}{9}$ %

34. By how much is 30% of 80 greater than $\displaystyle\frac{4}{5}th$ of 25?
a. 2
b. 4
c. 10
d. 15

Answer: B

Explanation:
Let the business value changes from x to y.
It is $\left( {\displaystyle\frac{{30}}{{100}} \times 80 - \displaystyle\frac{4}{5} \times 25} \right) = (24 - 20) = 4$

35. 12.5% of 192 = 50% of ?
a. 48
b. 96
c. 24
d. None of these

Answer: C

Explanation:
Let 12.5% of 192 = 50% of x.
Then, $\displaystyle\frac{{12.5}}{{100}} \times 192 = \displaystyle\frac{{50}}{{100}} \times x$
Then, x = $\displaystyle\frac{{12.5 \times 192}}{{50}} = 48$