Question

How much did Briana save by purchasing a backpack that cost $45 with a sales promotion of 20% off instead of a backpack that cost $42 with a sales promotion of 10% off?$1.80$3.00$4.80$6.90

Answer 1

Briana saved $1.80

Further explanation

Algebraic expressions in mathematics are a combination of coefficients, numbers, variables, constants and arithmetic operations such as addition, subtraction, multiplication, and division.

Purchasing a backpack that cost $45 with a sales promotion of 20% off

`\tt 20\%* \$45=0.2* 45=\$9`

`\tt cost=\$45-\$9=\$36`

Purchasing a backpack that cost $42 with a sales promotion of 10% off

`\tt 10\%* \$42=0.1* 42=\$4.2`

`\tt cost=\$42-\$4.2=\$37.8`

Briana saved :

`\tt \$37.8-\$36=\$1.8`