Answer:
a) Dr: Cash 20000
Cr: Equity/Capital 20000
b) Dr: Goods 15000
Cr: Payable 15000
c) Dr: Cash 18000
Cr: Sales 18000
d) Dr: Payable 10000
Cr: Cash 10000
e) Dr: Goods 20000
Cr: Payable 20000
f) Dr: Payable 30000
Cr: Cash 24000
Cr: Profit and Loss 6000