Given, the cost price of each coat = Rs. 1500
Also the total number of coat purchased = 18
⇒We need to find out the cost of each coat and profit earned by brinda.
Now, we know that the total cost of 18 coats = total number of coats * cost of each coat.
⇒ Total cost of 18 coats = 18*1500
= 27000
⇒ Gain% = 6%
Now, we know that
gain = (gain%) x Cost price/100
⇒ Gain = (6 x 27000)/100
= 1620
Now, we know that Selling price = Gain + Cost price
⇒ Amount received by brinda = 1620 + 27000
= 28620
Customer pay sales tax = 4%
Now, we know that the Total Sales Tax = Cost x Sales Tax
⇒Total Sales Tax = (28620 x 4)/100
= 1144.8
Now, The cost price with the sales tax Total Cost = Cost + Total Sales Tax.
⇒ Total cost with sales tax = 28620 + 1144.8
= Rs. 29764.8
Cost Price of one coat = Total cost/ number of coats
⇒ Cost price of one coat = 29764.8/18
= Rs.1653.6
⇒ Profit earned by Brinda = 28620 – 27000
= 1620
Hence, Brinda earned the profit of 1620.