exam Maths Puzzle Numerical Ability

Barbara wants to leave a 15% tip on a bill of $82.50. Explain how she can figure this tip by estimation.

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Can someone help me on this problem?
I submitted this problem yesterday and did get a response, and the tutor got back quickly and drew up the graph for me, but the equation whic In one year, Cholena Youngblood earned the same amount of interest from an investment at 8%annual interest as an investment at 12% percent annual interest.She had invested $1500 more at 8%.How much money did she invest at 12%.