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sbanoali2896
26.06.2019 •
Mathematics
An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest. this investor found that if she interchanged the amounts she had invested she could increase her return by $90 per annum. calculate the total amount invested.
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Ответ:
Step-by-step explanation:
let x be one part of the money invested.
let y be the other part of the money invested.
x *(10/100) -- amount on 10% of interest per annum
y*(7/100)- amount invested on 7% of interest per annum
x *(10/100) + y*(7/100) =1400
on simplifying it
10x +7y =140000 --(1)
On interchanging the interest rate on x amount and y amount of the investor
x *(7/100) + y*(10/100) =1490
7x +10y =149000-(2)
on solving equation (1) and (2) we get
70x +49y =980000
70x + 100y =1490000
-51y= -510000
y=10000
and x=7000
So our total amount invested is 17000
Ответ:
2 miles
Step-by-step explanation:
Start by determining his speed. 1/5 mile / 6 minutes = 1 mile / 30 minutes.
Next, multiply his speed by the elapsed time: 1/30 miles/minute * 60 minutes = 2 miles