The applied input a.c. to a half wave rectifier is 120 watt. The d.c. output is 50 watt. What is the rectification effeciency and power effeciency?

The applied input a.c. power to a half wave retifier I 100 watt. The d.c. output power obtained is 40 watt. (i) What is the rectification efficiency and (ii) What is the power efficiency?