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$.3/19,$ net $60.$

Cost of lost discount

$\%$

b$.2/19,$ net $45.$

Cost of lost discount

$\%$

c$.4/19,$ net $45.$

Cost of lost discount

$\%$

d$.3/16,$ net $190.$

Cost of lost discount

$\%$