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The stock price today of company A is $100

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The stock price today of company A is $100. Company A does not make
any dividend payments. Company A’s volatility (σ) is 0.20. Two European
call options with maturity one year from now are traded on the stock of
company A. The first call option (C1) has an exercise price of $90, while the
second call option (C2) has an exercise price of $110.
You obtain a portfolio by buying two company A stocks, selling two C1
call options, and buying one C2 call option. You use the Black-Scholes option pricing formula. The premium for the C1
call option is $16.70. The corresponding European put option (P1) with the
same maturity and an exercise price as the C1 call option has a premium of
$2.31.

What is the risk-free interest rate?
Calculate the premium for the C2 call option?