Q6. 
If the price of petrol increases by $25%$, by how much must a user cut down his consumption so that his expenditure on petrol remains constant? 
A.  $25\%$ 

B.  $16.67\%$ 

C.  $20\%$ 

D.  $33.33\%$ 
Q7. 
A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation? 
A.  $34\%$ 

B.  $44\%$ 

C.  $54\%$ 

D.  $64\%$ 
Q8. 
Ritesh and Co. generated revenue of Rs. 1,250 in 2006. This was $12.5\%$ of its gross revenue. In 2007, the gross revenue grew by Rs. 2,500. What is the percentage increase in the gross revenue in 2007? Note: As Vejayanantham TR points out in the comment, the question has been modified to find 'gross revenue' increase, instead of 'revenue' increase. 
A.  $12.5\%$ 

B.  $20\%$ 

C.  $25\%$ 

D.  $50\%$ 
Q9. 
Gauri went to the stationers and bought things worth Rs. 25, out of which 30 paise went on sales tax on taxable purchases. If the tax rate was $6%$, then what was the cost of the tax free items? 
A.  Rs. 15 

B.  Rs. 15.70 

C.  Rs. 19.70 

D.  Rs. 20 
Q10. 
if $\left(\dfrac{x+y}{xy}=\dfrac{4}{3}\right)$ and $x ≠ 0$, then what percentage (to the nearest integer) of $x + 3y$ is $x – 3y$ ? 
A.  $20\%$ 

B.  $25\%$ 

C.  $30\%$ 

D.  $40\%$ 