



 
Hi Peter, I drew a diagram with the diameter of the base $D$ inches, the diameter of the top $d$ inches and the height $h$ inches. Since the taper is 10% the quantity $x$ in the diagram is 105 of $h,$ that is $x = 0.1 \times h.$ Thus \[d = D  2h = D  0.2 \times h.\] Penny  


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