If a vendor offers a 30% discount on a shirt costing $45, what will be the retail price set by the shop manager using a keystone pricing strategy with an additional $5 added?

To determine the retail price using a keystone pricing strategy, first, calculate the amount of the discount and the price after the discount is applied.

The original cost of the shirt is $45. A 30% discount on this amount is calculated as follows:

30% of $45 = 0.30 x 45 = $13.50.

Subtract this discount from the original price:

$45 - $13.50 = $31.50.

Now, under a keystone pricing strategy, the shop manager typically doubles the cost to set the retail price. In this case, the base price after the discount is $31.50. Doubling this to apply the keystone strategy gives:

$31.50 x 2 = $63.

As an additional step, the shop manager adds $5 to this amount:

$63 + $5 = $68.

Thus, the retail price set by the shop manager, following the keystone pricing strategy and the additional $5, is $68.