Find the annual simple interest rate. i=$426, p=$1200, t=5 years

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?