Explanation:
Cost Price =Rs.200
Shopkeeper Mark the price 40% above the cost price then
M.P=200+40%of200
⇒200+ 
100
40
 
 ×200
⇒200+80=Rs.280
Discount=20%
Then Price after discount=280−20%of280
⇒280− 
100
20
 
 ×280
⇒280−56=Rs.224
Sales tax rate=10%
Then sales price=224+10%of224
⇒224+ 
100
10
 
 ×224
⇒224+22.4=246.4∼Rs.246