A manufacturer produces closed cylindrical cans of height 20cm. To make one can, a thin sheet of metal is used such that 0.05g of metal is required for every square centimetre of surface area covered.
If 110g of metal is used for one can, determine:
a. (i) the total surface area of the can.
b. (ii) the radius of the base of the can. (Take π=3.14.)
c. (iii) how much metal (in grams) would be saved per can if the company decided to remove the top cover while keeping all other dimensions unchanged.