Please can you help me with the question. Thank you ;)

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?