Alright, let's work through 7975 times 4900 step by step
7975 × 4900 = 4900 × (7975)
+ 4900 × 5 that results in 24500
+ 4900 × 70 that is equal 343000
+ 4900 × 900 that equals 4410000
+ 4900 × 7000 which equals 34300000

= 39077500
