Use the following in A cylindrical container with a volume of 4 litres is to be made from two types of metal. The one covering the ends is five times more expensive than the metal used for the lateral surface area. NOTE: V =172h SA =2nr2 +2arh h 1 . Given that a is the price per cm of the lateral surface area, which of the following expressions can be used to determine the most economical dimensions? (Hint: 1L = 1000 cm3) 8000 + 2172 r O -4000 + 4TT O 4000a + 4anr 8000a + 10aur2