Question 1058622
Let x represent the rate at Bank A.


The rate at Bank B is then x + 1.5.


The total interest earned is then:


(8400)(x/100) + (7000)(x + 1.5)/100 = 751.80


Multiplying through by 100 gives:


8400x + 7000x + 10500 = 75180


15400x + 10500 = 75180


15400x = 75180 - 10500


15400x = 64680


x = 64680 / 15400


x = 4.2


Solution: The rate at Bank A is 4.2%, and the rate at Bank B is 4.2% + 1.5% = 5.7%



Check:


8400(0.042) + 7000(0.057) = 352.80 + 399.00 = 751.80