Question 1134768
.
<pre>
9  one-digit numbers from 1 to 9:  9 digits, in all.


90 two-digit numbers from 10 to 99:  2*90 = 180 digits, in all.


225-99 = 126 three-digit numbers from 100 to 225:  3*126 = 378 digits, in all.



The total number of the digits  is  9 + 180 + 378 = 567.


The student earns  0.5*567 = 283.50 dollars.     <U>ANSWER</U>
</pre>

Solved.


-----------------


Do not forget to send your "Thanks" to me after completing reading my post.