A college student realized that he was spending too much money on music. For the remaining 5 months of the year his goal is to spend a mean of $⁢50 a month towards music. How much can he spend in December, taking into consideration that in the other 4 months he spent $20 , $⁢75 , $⁢20 , and $⁢90 , respectively? Round your answer to two decimal places, if necessary.