In solving the division problem 47 ÷ 2.4, a student transforms the problem to 470 ÷ 24. This operation is equivalent to which of the following?
1) 47/2.4 x 10/10
2) (47 ÷ 10) ÷ 2.4
3) 2.4/47 x 10/10
4) (47 ÷ 2.4) ÷ 10