In an election two candidates participated. 20% voters did not cast their votes. 12\(\frac{1}{2}\)% votes declared invalid and winner gets 60% of the valid votes and won by 5600 votes. Find the number of voter in the list.

40,000

Let total votes = 100 R

                            ↓

Votes casted        80 R

                            ↓

valid votes          70 R

ATQ,

                  70 R × 20% = 5600

                          100 R = \(\frac{5600 × 100}{70 × 20}\) × 100

                                   = 40,000