I just need help with questions $7-13$

Suppose that $10$ years ago you bought a home for $$160,000,$ paying $10\%$ as a down payment, and financing the rest at $9\%$ interest for $30$ years.

Your existing mortgage $($the one you got $10$ years ago$)$

$1)$ How much money did you pay as your down payment?

$$16,000$

$2)$ How much money was your existing mortgage $($loan$)$ for?

$$144,000$

$3)$What is your current monthly payment on your existing mortgage?

$$1,157\mathrm{.}79$

$4)$ How much total interest will you pay over the life of the existing loan?

$$273,604\mathrm{.}40$

This year $(10$ years after you first took out the loan$),$ you check your loan balance. Only part of your payments have been going to pay down the loan; the rest has been going towards interest. You see that you still have $$128,779$ left to pay on your loan. Your house is now valued at $$190,000.$

Your current situation

$5)$ How much of the original loan have you paid off? $($i$.$e$,$ how much have you reduced the loan balance by$?$ Keep in mind that interest is charged each month $-$ it's not part of the loan balance.$)$

$$15,221$Correct

$6)$How much money have you paid to the loan company so far $($over the last $10$ years$)?$

$$138,934\mathrm{.}80$

$7)$ How much interest have you paid so far $($over the last $10$ years$)?$

$

$8)$How much equity do you have in your home $($equity is value minus remaining debt$)$

$

Since interest rates have dropped, you consider refinancing your mortgage at a lower $6\%$ rate.

$9)$ If you took out a new $30$ year mortgage at $6\%$ for your remaining loan balance, what would your new monthly payments be$?$

$10)$ How much interest will you pay over the life of the new loan?

$

$11)$ Notice that if you refinance, you are going to be making payments on your home for another $30$ years. In addition to the $10$ years you've already been paying, that's $40$ years total.

How much will you save each month because of the lower monthly payment?

$

$12)$ How much total interest will you be paying $($consider the interest you paid over the first $10$ years of your original loan as well as interest on your refinanced loan$)$

$

$13)$ Now the non$-$computational question: Does it make sense to refinance? $($there isn't a correct answer to this question. Just give your opinion and your reason$)$