Alright, let's work through 9729 times 7507 step by step
9729 × 7507 = 7507 × (9729)
+ 7507 × 9 giving us 67563
+ 7507 × 20 that equals 150140
+ 7507 × 700 giving us 5254900
+ 7507 × 9000 that is equal 67563000

= 73035603
