One-fourth of the students are seniors: (1/4)S = seniors, where S is the total number of students.
One-fifth of the seniors major in business: (1/5)(1/4)S = senior business majors.
Two-fifths of all students major in business: (2/5)S = total business majors.
Non-senior business majors = total business majors - senior business majors = (2/5)S - (1/5)(1/4)S = (8/20)S - (1/20)S = (7/20)S.
Now, let’s find the ratio of senior business majors to non-senior business majors:
Senior business majors : Non-senior business majors = (1/20)S : (7/20)S = 1 : 7.
So, the correct answer is:
C. 1 : 7
Price of shoes = 3 times the price of jeans + $20 = 3j + $20
Price of sweater = 50% more than the price of shoes = 1.5(3j + $20) = 4.5j + $30
Now, let’s find the total price of a pair of shoes, a sweater, and a pair of jeans:
Total price = Price of shoes + Price of sweater + Price of jeans
= (3j + $20) + (4.5j + $30) + j
= 8.5j + $50
So, the correct answer is:
E. 8.5j + 50