help with question 5 please

Question 4 Answer saved Points out of 1.00 P Flag question Recall the previous project, with specified precedents and expected durations (in days). We now would like to shorten the project and have added a column that tells how much it would cost per day to shorten that activity (and an activity cannot be shortened to be any less than 1 day). What is the least amount we could pay to shorten the project by 3 days? Express your answer as a number without the $ sign. Activity PrecedentDuration Per day cost to crash $20 2 B A A 1 A $30 D A 5 NoN $25 m E