The average yearly output for a shop is about $$120,000.$ Considering costs of labor to be about $$50,000,$ material about $$10,000,$ and the rental cost of $$18,000,$ what is the total productivity in a year?

a$.$

$1\mathrm{.}000$

b$.$

$1\mathrm{.}5$

c$.$

$2\mathrm{.}4$

d$.$

$4\mathrm{.}28$

e$.$

$1\mathrm{.}78$