Can you answer my math question (primary school)

round number,-1

Step-by-step explanation:

b=19,29,39,49

so b=round number x a-1

(round number=10,20,30,40,...)

I hope it's wil help you much

Thank you for asking

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p