QUESTION $1(10$ MARKS$)$

On $18$ July $2024,$ Adam received an invoice for purchasing $40$ hard disks amounting RM$9,870.$

She planned to sell the batteries by allowing $20\%$ of the cost for operating expenses and $35\%$

of the selling price for net profit.

If Adam managed to sell $28$ hard disks in two months. The remaining hard disks were sold by

allowing $30\%$ markdown. Calculate the total sales made.