book Maths Puzzle Numerical Ability

Emily received $1,240 from selling her car. She inversted part of the money at 8% and the rest at 7%. Her overall return was 7.59%. How much did Emily invest in thew account which

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I am a parent trying to help.
We need to solve for P

equation- A=P(1+r)^t

we are not sure how to move the exponent "t"
Thank you I am trying to remember how to do radical algebraic expressions and if you could just give me a sample that would be great an example problem is

150 over (square root sign) 300 and you have to simplify it.

PLEASE HELP