Question

Graph shows the number of units consumed by a family for six months. Find the cost of energy for four months from March to June if M.S.E.B increased its unit rate from Rs. $3.50$ to Rs. $4.50$ for April and May and again decreased by Rs. $2$ for June:

• A. Rs.$6000$
• B. Rs.$6,030$
• C. Rs.$6,300$
• D. Rs.$6,200$

Answer 1

The correct option is C Rs.$6,300$

Month	No. of units	Cost per unit	Total cost per month
January	$150$	$3.50$	$525$
February	$200$	$3.50$	$700$
March	$300$	$3.50$	$1050$
April	$500$	$4.50$	$2250$
May	$500$	$4.50$	$2250$
June	$300$	$2.50$	$750$

Therefore, the total cost for March, April, May and June

$=1050+2250+2250+750=Rs.6300$.

Hence, option $C$ is correct.