Find the cost ?

Question

The length of a rectangular blackboard is double its width. If the width is 1.4 m , find its area . Also find the cost of painting the blackboard at the rate of Rs 19 per m square .

Answer 1

Width = 1.4m

Length
= width * 2
= 1.4m * 2
= 2.8m

Area
= width * length
= 1.4m * 2.8m
= 3.92m^2

Cost of painting blackboard
= cost rate * area
= Rs 19 * 3.92
= Rs 74.48