Put-Call Parity Put Price

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A non-dividend-paying stock trades at $50. A European call with strike 55 and one year to expiry trades at $3. The simple annual interest rate is 4% (cash grows by a factor of 1.04 over the year).

What must the price of the European put with the same strike and expiry be to avoid arbitrage? Give an exact expression or a number accurate to at least 7 significant figures.

A non-dividend-paying stock trades at $50. A European call with strike 55 and one year to expiry trades at $3. The simple annual interest rate is 4% (cash grows by a factor of 1.04 over the year).

What must the price of the European put with the same strike and expiry be to avoid arbitrage? Give an exact expression or a number accurate to at least 7 significant figures.