Tyler has two savings accounts that his grandparents opened for him. One of the accounts pay 8% annual interest, whereas the other pays 9% annual interest. If you have $200 more invested at 9% than you invested at 8%, how much do you have invested in each account if the total amount of interest you earn in a year is $69?
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Ответ:
You have invested $300 at 8% and $500 at 9%.
Explanation:
From the information given you can write the following equations:
y=x+200 (1)
0.08x+0.09y=69 (2)
x is the amount invested at 8%
y is the amount invested at 9%
You can replace 1 in 2 and solve for x:
0.08x+0.09(x+200)=69
0.08x+0.09x+18=69
0.17x=69-18
x=51/0.17
x=300
Then, you can replace the value of x in 1 to find the value of y:
y=300+200
y=500
According to this, you have invested $300 at 8% and $500 at 9%.
Ответ:
Explanation:
Power is defined as the ratio of work done to the time taken.
Power = Work / time
If more power then it means a large amount of work done in small interval of time.
Thus, it means the person performs more work in small interval of time.