An organisation operates a piecework system of remuneration, but also guarantees its employees 80% of a time-based rate of pay which is based on $20 per hour for an eight hour working day. Tree minutes is the standard time allowed per unit of output. Piecework is paid at the rate of $18 per standard hour. If an employee produces 200 units in eight hours on a particular day, what is the employee’s gross pay for that day? A $128 B $144 C $160 D $180