book Maths Puzzle Numerical Ability

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2(x+3.1)=9.8

PLEASE HELP ME AS SOON AS POSSIBLE I NEED MY HOMEWORK DONE BY 3:15!!!!!!! sorry to rush you! Tom invested 13,000.00 for one year, part at 9 percent annual interest and the rest at 7 percent annual interest. How much must he invest at 9 percent to get $1000.00 in interest in a year?