Please help if you know

Pls! does anybody know a shortcut for answering these types of questions in the future?

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?