Given an aggregate demand for eight periods are expected to be $600,500,800,800,700,600,700$ and

$900.$ Cost of hiring is at Rs$.100$ per unit. Cost of firing is at Rs$\mathrm{.}50$ per unit. Subcontracting$/$Outsourcing

cost is at Rs$.50$ per unit. Carrying cost is Rs$.50$ per unit. In the first quarter of the year hiring$/$firing

strategy is used. In the second quarter subcontracting and in the third quarter constant level production

is used. Which is the best strategy for system planning for preparing the candies?