How to calculate the percentage and the sum in one operation?

Depends on how long you're financing your car for. If you're paying it all upfront and no monthly payment you'll use the compound interest formula: A = 26000(1.07) = 27820

If you're planning on making monthly payments and want to know what your monthlypayment will be you can use this annuity formula to figure that out: *note: n= #of years you wish to finance for ie. 3 years or 5 years or whatever.

monthly payment = [26000*(0.07/12)] / [1 - (1+ (0.07/12))^(-n)]

If you're going for 3 years of payments your monthly payment will be about: $798.15 for a total of $789.15 * 36 = 28409.40.

If you're going for 5 years of payments your monthly payment will be about: $511.85 for a total of $511.85 * 60 = $30711

Note: there may be other costs associated with the purchase of your car not included here so be sure to talk to your car dealer about them before you buy anything.

hope this helps! Good luck!

26000 x (1 + 0.07)
= 26000 x (100% + 7%)
= 26000 x 107%
= 26000 x 107/100
= 2782000/100
= 27820

I am not sure whether you meant what the original price was if the 7 % reduced price was 26,000? If so,
Assume that 7 percent of X is 26000
This means (7)(X) / 100 = 26000
X = (100)(26000) / 7
X = 371,428.57 original price.
7 percent of 371428.57 is 26000

Total Price = P(1+p) where P is the price and p is the %.

whole sum = 26000 + (26000*0.07)