A Voltage V Is Applied to the Primary Coil of a Step-Up

A voltage V is applied to the primary coil of a step-up transformer with a 3:1 ratio of turns between its primary and secondary coils. A resistor R connected to the secondary dissipates a power P = 100 W. How much power is dissipated by the same resistor when the ratio of turns in the transformer is changed to 24:1 and the same input voltage is used?

A) 12,000 W
B) 2400 W
C) 24,000 W
D) 6400 W
E) 100 W