exam Maths Puzzle Numerical Ability

joe purchased a jacket at a 10% discount sale for 121.50 what was the original price of the jacket

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exam Other Question

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

Please help me on this how do youe create liear equation from set of points