Answers

2016-02-10T11:09:24+05:30
Length of blackboard = 8dm + 5cm = 80cm + 5cm = 85cm
Breadth of blackboard = 5dm + 5cm = 50cm + 5cm = 55cm
Therefore area of blackboard 
= length*breadth
= 85*55
= 4675 sq.cm

Rate of charge = 20 paise per sq.cm = Rs. 20/100 = 1/5 per sq.cm
Therefore cost = 4675*1/5 = Rs. 935
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