48 plus 510 is 558
9 + 510 + 4 = 523
510 + 810 = 1320
520
3610
You would multiply 510 by 1.2 to get your answer. The idea is: 510 plus twenty percent of 510 would be 1 X 510 + .2 X 510. Factoring out the 510 from each of these terms you get 510 (1 + .2)
1544
510 cm or 5.10 m
8980
370.58
18 + 492 = 510
370.58