When Joseph first starts working at a grocery store, his hourly rate is \$10$10dollar sign, 10. For each year he works at the grocery store, his hourly rate increases by \$0.50$0.50dollar sign, 0, point, 50. Joseph's hourly rate RRR, in dollars, is a function of ttt, the number of years he works at the grocery store. Write the function's formula. R=