Which equation can be used to answer the question below?

Eva marked 18% of the e-mails in her Inbox as Important. If she has 150 e-mails in her Inbox, How many did she mark as Important?

A. 22%
B. 25%
C. 31.25%
D. 45.5%

Need on this one asap im almost done with this subject

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them