A local gym runs a membership promotion where they charge a one-time registration fee plus a monthly fee. The registration fee is $50, and the monthly fee is $30. Let x represent the number of months a member has paid. The total cost C of a gym membership after x months is represented by the linear function:

$$C = 50 + 30x$$

How much will the total cost be if a member continues their membership for 8 months? Enter your answer as a number.