Question 1105149
This is 0.85^4*0.15=0.0783
Sale on the first call is 0.15
make first sale (note editing) on second call is 0.85*0.15=0.1275
Make first sale on third call is 0.85^2*0.15=0.1084
Make no sale on first three calls is 0.85^3=0.6141