Answer and Explanation:
The computation is shown below:
a. The new customer retention rate is
(a) the day above 3 days from order to delivery
= 3.5 - 3
= 0.5 days
And,
The reduction in customer retention rate is
= 0.5 × 1%
= 0.5%
errors above three per month is
= 6 - 3
= 3
The reduction in customer retention rate is
= 3 × 1.5%
= 4.5%
So, the new customer retention rate is
= 60% - 0.5% - 4.5%
= 55%
(b) The total reduction in customer retention rate is
= 0.5 + 4.5
= 5.0%
The reduction in market share is
= 5% × 0.5
= 2.5%
Now
New market share is
= 21.4% - 2.5%
= 18.9%