A tank in 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq.m, is:

A Tk. 456

B Tk. 458

C Tk. 558

D Tk. 568

Correct Answer: Option C

surface area=25x12=300 sqm two walls area=26x6x2=300 sqm other two walls area=12x6x2=144 sqm so,total cost= 744 x 75=55800/100=558 tk