Compute the cost of not taking the following trade discounts: $($Use $365$ days in a year. Round the final answers to $2$ decimal places.$)$

a$.\frac{3}{14},$ net $65.$

Cost of lost discount $\%$

b$.\frac{3}{23},$ net $45.$

Cost of lost discount $\%$

c$.\frac{4}{11},$ net $55.$

Cost of lost discount $\%$

d$.4/18,$ net $145.$

Cost of lost discount $\%$