Points) During June, Colleen’s Motors sold 75 cars with heated seats, 95 with GPS, and 100 with a sunroof. Twenty cars had all three options. 10 cars had none of these options, and 10 cars were sold that had only heated seats. In addition, 50 cars had both a sunroof and a GPS, and 60 cars had both a sunroof and heated seats. a. How many cars were sold in June? b. How many cars had only a GPS?