Question

The diameter of circular lid is 2.8 m. How much will it cost to paint both sides of 100 such lids at rate of ₹20 per sq.m

Answer 1

area or both sides of lid = 2×π(d/2)^2
= 12.3 m^2
cost for painting ane lid = 12.3×20
= ₹ 246
cost for 100 lids = ₹ 24600 approx

Answer 2

It will cost Rs.24640 to paint both sides of 100 such lids at rate of ₹20 per sq.m

Step-by-step explanation:

Diameter of circular lid = 2.8 m

Radius of circular lid = $\frac{2.8}{2}=1.4 m$

Area of circular lid =$\pi r^2 = \frac{22}{7} \times 1.4^2 =6.16 sq.m.$

Area of both sides = 6.16 +6.16 =12.32  sq.m.

Area of 100 lids = $12.32 \times 100 = 1232 sq.m.$

Cost of painting 1 sq.m. = Rs.20

Cost of painting 1232 sq.m. =$1232 \times 20=24640$

Hence It will cost Rs.24640 to paint both sides of 100 such lids at rate of ₹20 per sq.m

#Learn more:

The radius of a circular lid of water tank is 0.7 m. How much will it cost to paint,

both sides of 150 such lids at the rate of 25 per sq. m ?

1) 5775 2) 11550 3) 10500 4) 11500

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