bill is buying a pair of jeans that cost $20. he has to pay 5% sales tax. how much will he pay in all? $?

bill is buying a pair of jeans that cost $20. he has to pay 5% sales tax. how much will he pay in all? $?
Answer
Explanation:
Step1: Calculate sales - tax amount
The sales - tax rate is 5% or 0.05 in decimal form. The cost of jeans is $20. The sales - tax amount $t$ is calculated by multiplying the cost of the item by the sales - tax rate, so $t = 20\times0.05=1$.
Step2: Calculate total amount paid
The total amount $A$ Bill pays is the sum of the cost of the jeans and the sales - tax amount. So $A=20 + 1=21$.
Answer:
21