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christopherandp66l91
17.04.2020 •
Mathematics
What is the rate of the interest on $560 for two years is $145.60?
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Ответ:
The rate of interest is 13%.
Step-by-step explanation:
Given,
Principal (P) = $560
Interest (I) = $145.60
Time (T) = 2 years
To find the rate of interest
Formula
If P principal was invested for T years at r% simple interest, the interest will be I =![\frac{PTr}{100}](/tpl/images/0607/3133/edfa4.png)
So,
Putting the values of P, I, T we get,
145.60 =![\frac{560X2Xr}{100}](/tpl/images/0607/3133/ec2fe.png)
or, r =![\frac{145.60X100}{2X560}](/tpl/images/0607/3133/430b0.png)
or, r = 13%
Hence,
The rate of interest is 13%.
Ответ:
(a - 5) (a + 5) = (a*a + a*5) + (-5*a + -5*5)
= a^2 + 5a - 5a - 25
= a^2 - 25