A three-phase induction motor, operating at rated voltage and frequency, has a starting torque of 135 percent and a maximum torque of 220 percent, both with respect to its rated-load torque. Neglecting the effects of stator resistance and rotational losses and assuming constant rotor resistance, determine:

a. The slip at maximum torque.

b. The slip at rated load.

c. The rotor current at starting (as a percentage of rotor current at rated load).