Question

you save 30% of your income and use 10% of the mainder for internet purchase. What percentage ur income is left for other purposes?​

Answer 1

Explanation:

Subtract 30% of your income(I) leaves you with:

`D_1=I-(30)/(100) I=I(1-(30)/(100))=(7)/(10)I` (where
`D_1` is amount left after savings)

Subtract 10% of your remaing money (
`D_1`) for internet payment:

`D_2=D_1-(10)/(100) D_1=D_1(1-(10)/(100) )=(9)/(10) D_1` (where
`D_2` is amount left after

internet payment)

Substitute
`D_1=(7)/(10)I` into
`D_2=(9)/(10) D_1`:

`D_2=(9)/(10) *(7)/(10)I=(63)/(100)I`

Solution: After both deductions you still have 63% of your income.

Answer 2

Explanation:

If you save 30% of your income, then you are left with 70% of your income.

Let's say your income is $100. You save 30%, which is $30, and you are left with $70.

You use 10% of the remainder ($70) for internet purchases, which is $7.

Therefore, the percentage of your income that is left for other purposes is:

($70 - $7) / $100 x 100% = 63%

So, 63% of your income is left for other purposes after saving 30% and using 10% of the remainder for internet purchases.