Question 170768
well I cant see the shaded area but I think I know what they are after .

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Area of the total is {{{A=(pi)10^2}}} Area of the interior portion is {{{A=(pi)3^2}}}  we have {{{100(pi)-9(pi)}}}= {{{91(pi)}}}={{{highlight(A=285.74)}}}sq in
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{{{285.74(7.5)=highlight(2143.05)}}}dollars