At least 240
Store A charges initially less than store B, and uses a smaller percentage of sales tax. $1,200<$1,350. Meaning your saving $150 dollars as of initial payment.
Now looking at the tax percentage, you must find the sales tax. To calculate the sales tax divide the receipts from items subject to sales tax, and divide the receipts by 1+ the sales tax rate. In this case, we’ll be dividing the total amount of receipts by 1.06.