20 hundred = 20 * 100 = 2000 = 2 * 1000 = 2 thousand. So, it is correct that 20 hundred is equal to 2 thousand.
However, twenty hundredth is twenty parts out of hundred parts. Similarly, two thousandth is two parts out of thousand parts. So, twenty hundredth is 20/100 and two thousandth is 2/1000.
20/100 can also be represented as (20 * 10)/(100 * 10) = 200/1000. So, it can be clearly seen that 20 hundredths is not equal to 2 thousandth. In fact, 20 hundredths is 100 times as much as 2 thousandth.
20/100 = (20 * 10)/(100 * 10) = 200/1000 = (2/1000) * 100
So, what Janice thinks is incorrect.