exam Maths Puzzle Numerical Ability

if you were to leave a 15% tip for a meal at a restaurant where the total bill came to $13.80, how much would the tip amount to?

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I hope this is posted in the correct place. I need some help I do not understand how to do this. Thanks for any help you can give.
solve by elimination process and type an ordered pair.
4x - 9y = 14.5
7y - 2x = -8.5 A ramp 17.5 feet in the length rises to a loading platform that is 3 1/3 feet off the ground. Find the angle that the ramp makes with the ground?