The answer is 1166. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
4800 + 840 = 5640
326 + 271 = 597
It equals 326
The answer = 3480
504 + 10% is not 840 so it must be a calculation error.
it equals 822
The answer is 4550
326
12363839
840
840
15 percent of 840 = 12615% of 840= 15% * 840= 0.15 * 840= 126