Question 991355
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R=rate for $8000 in decimal form
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$8000R+$270=(R-0.01)$13000
$8000R+$270=$13000R-$130
$400=$5000R
0.08=R
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ANSWER: The $8000 was invested at 8%.
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CHECK:
$8000R+$270=(R-0.01)$13000
$8000(0.08)+$270=(0.08-0.01)$13000
$640+$270=(0.07)$13000
$910=$910