#### Answer

2042

#### Work Step by Step

Number of years after 1960 = x
Need to solve for the number of years to become 0%,we have an equation as $23-0.28x=0$
or, $0.28x=23$
or, $x=82$ (approximately)
Hence, we can conclude it will take approximately $1960+82=2042$ years when the 0% corporations will pay zero taxes.