Cash$-$Basis and Accrual$-$Basis Income

Martin Sharp operates a lawn mower repair business. He maintains an inventory of repair parts that are purchased from a wholesale supplier. Martin's records sh following information for the first $3$ months $($ January, February, and March$)$ of the year:

$\backslash$table$[[,\backslash$table$[[$Cash Collected for$],[$Repair Work$]],\backslash$table$[[$Amounts Billed$],[$to Customers$]],\backslash$table$[[$Cash Payments to$],[$Supplier$]],\backslash$table$[[$Cost of Parts$],[$Used in Repairs$]]],[$January$,$$$2,500,$$$820,$$$710,$$$635$