Transformer example problem

Problem:

An ideal transformer with a 300 turn primary connected to a 220 V, 60 Hz supply line is to output 110 V from the secondary. If a 100 Ω resistor is connected across the secondary, determine: A) how many turns the secondary must have. B) The current through the resistor, C)The current drawn through the primary.

Solution:

Part A:

${\frac {V_{1}}{V_{2}}}={\frac {N_{1}}{N_{2}}}$
Where $V_{1}=$Voltage across primary $V_{2}=$Voltage across secondary $N_{1}=$ Number of turns in primary $N_{2}=$ Number of turns in secondary

${\frac {240volts}{110volts}}={\frac {300}{N_{2}}}$