Barbara Kardashian is a new accountant with Flint Discount Retail Company. Flint purchased merchandise on account for $$9,000.$ The credit terms are $\frac{1}{10}\frac{n}{30}.$ Barbara has talked with the compary's banker and knows that she could eam $10\%$ on any money invested in the compary's savinge account.

$($a$)$

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Should Barbara pay the invoice within the discount period or should she keep the $$9,000$ in the savings account and pay at the end of the credit period? $($Use $360$ days for calculation$)$

Barbara take the discount as it will result in ofs

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$($b$)$

If Barbara forgoes the discount, it may be viewed as paying an interest rate of $18$ for the use of $$9\mathrm{.}000$ far $20$ days.

Calculate the annual rate of interest that this is equivalent to$.($Round answer to $0$ decimol ploces, es: $25\%.$ Use $360$ days for calculation.$)$

Equivalent annual interest rate is

$\%$