the radius of a sphere is 14cm . the cost of painting the surface of sphere is rs 25 per square cm. if the radiusvof sphere is increased by 10%, then the cost of painting is increased by 20%. what is the percentase increase in the total cost of painting per square cm?
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Total cost of painting = Rate × Surface area of sphere As the radius increases by 10%. Surface area will change by 21% [using formula a + b + (a × b)/ 100 Total change in cost of painting = 20+21 +(20x21)/100 = 45.2%.
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