How many times the keys of a writer have to be pressed in order to write first 250 counting no's?	Choose the correct choice from the following options: A) 632 B) 642 C) 652 D) 662 E) 672
1 to 9 = 9 * 1= 
<gadget id="calculator">9 * 1</gadget>
<output>9</output>
9   10 to 99= 90 * 2= 
<gadget id="calculator">90 * 2</gadget>
<output>180</output>
180   100 to 250= 151 * 3= 
<gadget id="calculator">151 * 3</gadget>
<output>453</output>
453   -----------   642   642
<result>B</result>
How many times the keys of a writer have to be pressed in order to write first 250 counting no's?