Cаrоl stаrted the summer with $30. She tооk $10 аnd made signs for her Accounting class tutoring service. She posted the signs all over her neighborhood. She used the other $20 to buy a calculator and a box of Kleenex for when her clients cry during her difficult lessons. At the end of the summer, after buying herself a better calculator for $50 (the keys fell off on the previous one due to her brutal pounding on the numbers), she had $125 left. What was Carol's profit for her summer job?