Week 3: Muddiest point - Data compression

I'm sure that I'll have a few more questions by the end of the week, but for starters I have this from the 2nd text on data compression:

Item X = 6
1I 1t 1e 1m 1 1X = 12

$100.00 = 7
1$ 11 20 1. 20 = 10

My problem is:
Item X*[60].*$100.00 = 17
(Item x = 6) + ($100.00 = 7) + (x = 4) = 17
What is the value of x? Is it [60]., where 60 is considered '1'?


Same issue here:
Figaro was the city's factotum*. = 32
Figaro was the city's factotum*[1]**. = 35
32 + x = 35
x = ?