$32$ Business Mathematics: fifth edition

$4.$ On $1$ May $2020,$ Azizi took a loan from a bank that charges a simple interest rate of $5\mathrm{.}5\%$ per annum. On $28$ October $2020,$ he paid RM$14,320\mathrm{.}84$ to settle the loan. Using Banker's Rule, find $($a$)$ the term of the loan in exact number of days, and $($b$)$ the loan amount.

$5.$ On $12$ February $2020,$ Adnan invested RM$2,000$ in a bank and received an amount of RM$2,040$ on $23$ June $2020.$ Calculate the simple interest rate offered by the bank. $($Use Banker's Rule$).$

$[$Modified exam question$]$

$6.$ A debt of RM$6,000$ on $25$ April $2020$ became RM$6,180$ on $9$ June $2020.$

$($a$)$ What is the simple interest rate charged using the Banker's Rule?

$($b$)$ What is the value of the debt after one and half years?

$7.$ A loan was given out on $20$ August $2020$ at $7\%$ simple interest. It was paid up on $31$ December $2020$ with a payment of RM$9,299\mathrm{.}25.$ Find the loan amount using the Banker's Rule.

$8.$ A sum of money was deposited on $3$ March $2020$ in an investment fund which offered $7\%$ simple interest. On $12$ June $2020,$ RM$2,800$ was withdrawn from the fund. Find the initial deposit using Banker's Rule.

$9.$ On $8$ February $2020,$ Ken deposited RM$30,000$ in an account that offered $r\%$ simple interest per annum. If the interest earned on $20$ April $2020$ was RM$440\mathrm{.}00,$ find the value of $r$ using the exact time and exact simple interest.