Explain how you can mentally determine whether 125 multipled 0.9 is less than, greater than or equal to 125

Remember you can do anythng to an equaiton as long as you do it to both sides

125=125 times 1
so

note: the blank or underline represents a sign like = or < or >

125 times 0.9 ___ 125
125 times 0.9 ___ 125 times 1
divide both sides by 125
0.9 ___ 1
0.9<1
so the answer is less than

The discount is 8.70 . you dont tell us the percent of tax added so there is no way to find out, unless i'm not seeing anything. without tax its 37.70