Accounting equation for below transations from a business

$1.$ unwanted goods of R$800$purchased by Mrs$.$ Strong on account, was returned.The cost of the goods is R$500.$

$2.$Cash sales of R$750$ was made to Mrs$.$ Strong. The cost of the goods is R$400$

$3.$Fuel of R$800$ for the delivery truck was posted to the salaries and wages account

$4.$Mr$.$ Plan$$s son was accepted to study at the university. The stationery needs are not yet communicated. As Mr$.$ Plan will be travelling he paid a deposit of R$4000$ to Polka$-$Dot $($Pty$)$ Ltd to apply to his son$$s stationery needs

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