A sum of money amounts to 10000 after 5 years and 15000 after 8 years at the same rate of simple mterest. Find the rate of interest per annum.​

Rate of interest = 99.99%

Step-by-step explanation:

The computation of the rate of interest is shown below:

Given that

The amount after 5 years is 10,000

And, after 8 years it is 15,000

so for 3 years, it is

= 15000 - 10000

= 5000

Now the simple interest for one year

= 5000 ÷ 3

And, for five years, its is = 5000 ÷ 3 × 5

= 8333.33

Now the principal amount is

= 10,000 - 8333.33

= 1666.67

Now finally the rate of interest is

8333.33 = 1666.67 × Rate of interest × 5

Rate of interest = 99.99%

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3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!