Question

A blackboard is 2 m 25 cm long and 1 m 15 cm broad. Find the cost of painting the blackboard at the
rate of 25 paise per sq cm.
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Answer 1

Step-by-step explanation:

Length of the blackboard =2m 25cm into cm

=2×100cm+25cm

=200+25cm

= 225cm.

Breadth of the blackboard = 1m 15cm

= 1×100cm+15cm

= 100+15cm

=115cm

Area of rectangular blackboard = Length × Breadth

= 225cm× 115cm

= 25875 cm²

Cost of painting 1 cm² blackboard = 25 paise

So the cost of painting 25875 cm²=

= 25873×25 paise

= 646,825paise into rupee

1 rupee = 100 paise

1 paise = 1÷100

646825 paise= 646,825

100

= 646.825 Rupees.