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(C) The area $A$ covered by a transmitting tower of height $h$ is given by the formula $A = 2 \pi R h$,where $R$ is the radius of the Earth.From this

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$30$

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(C) The area $A$ covered by a transmitting tower of height $h$ is given by the formula $A = 2 \pi R h$,where $R$ is the radius of the Earth.From this relation,it is clear that $A \propto h$.If the height $h$ is increased by $30 \%$,the new height $h'$ becomes $h' = h + 0.30h = 1.30h$.Since $A \propto h$,the new area $A'$ will be $A' = 2 \pi R h' = 2 \pi R (1.30h) = 1.30 A$.The percentage increase in the area is given by $\frac{A' - A}{A} 	imes 100 = \frac{1.30A - A}{A} 	imes 100 = 0.30 	imes 100 = 30 \%$.Therefore,the area covered by the tower increases by $30 \%$.

If the height of the transmitting tower is increased by $30 \%$,then the area covered by it increases by (in $\%$)

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