Answer :
E = 50 + 0.03 S / Equation of weekly earning
100 = 50 + 0.03S
50 = 0.03 S
S = 50 = 1666 67 / Total Sales
0.03
100 = 50 + 0.03S
50 = 0.03 S
S = 50 = 1666 67 / Total Sales
0.03