First compute the total sales
Total sales = 2030 + 1540 + 1800 = 5370
The fraction of each are:
Lola = 2030 / 5370 = 0.378
Ahmed = 1540 / 5370 = 0.287
Tommy = 1800 / 5370 = 0.335
Bonus they get
Lola = 100 x 0.378 = $37.8
Ahmed = 100 x 0.287 = $28.7
Tommy = 100 x 0.335 = $33.5