Hi,

May I be assisted with the following please?

1.) A book was sold for $45 at a loss of 10%. What was the original price?

$\displaystyle 10 \% \times 45 = 4.5$

$\displaystyle \$45 + 4.5 = \$49.5$

$\displaystyle \rm{Original \ Price} = \$49.5$

2.) A man bought a chair for $350. He sold it at a profit of 25%. How much was the selling price?

$\displaystyle 350 \times 0.25$

$\displaystyle = 87.5$

$\displaystyle \rm{Selling \ Price} = 87.5 + \$350 = \$437.50$