Question

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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Answer 1

${\underline{\underline{\huge{\mathfrak{\green{Answer:-}}}}}}$

Hey Mate!!

Given,

Radius of lid = 0.7 m

Area of circle = π$r^{2}$

$\frac{22}{7} \times 0.7 \times 0.7 \\ = > 22 \times 0.1 \times 0.7 \\ = > 1.54 \: {m}^{2}$

Thus, the area of 150 such lids,

= 1.54 × 150 = 231$m^{2}$

Therefore, cost of painting at RS. 25/$m^{2}$

= 231 × 25

= RS. 5775

Thus, your option is (1).