Solution : Given data : Cost of production of ice cream = 100 + 100 ⇒ Rs. 200/liter Dimensions of the cylindrical storage container, Diameter = 42 cm Height = 16 cm Dimensions of the cone, Diameter = 7 cm Height = 12 cm M.R.P. of cone = Rs. 50 Profit % of icecream parlour = 25% Formulae / Concepts used : Volume of cylinder = π × r2 × h The volume of cone = 1/3 π × r2 × h 1 liter = 1000 cm3 Selling Price = (100 – Discount %)/100 Selling Price = (100 + Profit %)/100 Discount % = × 100 Radius = Diameter/2 Calculation : The volume of ice cream produced = π × r2 × h ⇒ 22/7 × 21 × 21 × 16 ⇒ 22176 cm3 ⇒ 22176/1000 litre The cost price of ice cream = 200 × 22176\1000 ⇒ 4435.2 Rs. The selling price of Ice cream with 25% profit = 4435.2 × (5/4) ⇒ 5544 Rs. The volume of candy = π × r2 × h ⇒ 22/7 × 7/2 × 7/2 × 12 ⇒ 154 cm3 Total no. of candies that can be made from ice cream = (Total volume of ice cream)/(Volume of a cone) ⇒ 22176/154 ⇒ 144 The selling price of each cone = 5544/144 ⇒ Rs. 38.5 Discount % = × 100 ⇒ × 100 ⇒ 11.5 × 2 ⇒ 23% ∴ Ice cream parlour should give a discount of 23%.