Question

Find the lenght of time for:
$500 to be intrest on $1800 at 6%p.a

Find the rate percent per annum for:
15000 to be interest on $5400 for 5 years

Find the principal required for
The simple intrest to be $900 on an amount invested for 2 years at 10% p.a.

Answer 1

Assuming simple interest, the interest after 1 year is 1800 * 0.06. The number of years to reach a total amount of $500 interest is given by:
\[\frac{500}{1800\times0.06}=you\ can\ calculate\]

Answer 2

So the answer is 4.63 right
or125/27

Answer 3

Correct!

Answer 4

Thanks do uo you know how to do the others

Answer 5

Please check the values of the interest and the principal in the second part.

Answer 6

In the third part, let the principal amount be P.
900 = P * 0.1 * 2
\[P=\frac{900}{0.1\times2}=you\ can\ calculate\]

Answer 7

1500 to be interest on $5400 for 5 years

Answer 8

sorry got the Question wrong for second part

Answer 9

For the second part, assuming simple interest, let the interest rate as a decimal be r.
1500 = 5400 * r * 5
\[r=\frac{1500}{5400\times5}=you\ can\ calculate\]

Answer 10

=6%

Answer 11

For the second part, I get a yearly interest rate of approximately 5.55%.

Answer 12

Hey i got another question

$3200 at 10.25% p.a for 2 1/2 years compounded - 3 monthly

Answer 13

\[A=P(1+\frac{r}{n})^{nt}\]
\[A=3200(1+\frac{0.1025}{4})^{2.5\times4}\]

Answer 14

Wait how did u get 4

Answer 15

In the general equation, n is the number of compounding intervals per year. In your question the interest is compounded 3-monthly, giving 4 compounding intervals per year.

Answer 16

oh k

Answer 17

so the answer is 1053655670

Answer 18

ops wrong answer