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The following pie chart shows percentage expenses on various items during book production.
The central angle corresponding to the sector on 'Printing cost' is more than that of 'Advertisement charges' by
Central angle of Printing Cost = $$\dfrac{35}{100}\times360=126^{\circ}$$
Central angle of Advertisement Charges = $$\dfrac{18}{100}\times360=64.8^{\circ}$$
Difference between the central angle = $$126^{\circ}-64.8^{\circ}=61.2^{\circ}$$