Your consumer printer has the following relative advantages for the four purchase components of the product. What is your relative cost of purchase index?

Customer Cost of

Purchase Component

Relative Advantage

Purchase Price

$30$

Maintenance

$-14$

Toner

$10$

Paper

$0$

$6\mathrm{.}5$

$126$

$74$

$13\mathrm{.}5$

$54$