Which two signs should be interchanged to make the given equation correct?
306 ÷ 17 + 4 - 50 × 8 = 30

Let's check Option C by interchanging × and −:
The equation becomes:

306÷17+4×50−8
Following BODMAS rule:

Division: 306÷17=18

Multiplication: 4×50=200

Substitution: 18+200−8=218−8=210

=30

Let's test Option D (+ and -):

306÷17−4+50×8
18−4+400=414

=30
Let's test Option B (+ and ×):

306÷17×4−50+8
18×4−50+8=72−50+8=30
The LHS matches RHS (30=30). Thus, interchanging + and × makes the equation correct.