Wallace Motors buys and sells used cars. Wallace made the following sales during January and February: Three cars were sold to Russell Taxi for a total of $75,000; the cars were delivered to Russell on January 18. Russell paid Wallace $20,000 on January 18 and the remaining $55,000 on February 12. One car was sold to Hastings Classics for $24,000. The car was delivered to Hastings on January 25. Hastings paid Wallace on February 1. Required: Calculate the monthly revenue for Wallace for January and February. If answer is zero, enter "0".