How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? Choose the correct choice from the following answers
A) 1092  B) 1300  C) 1500  D) 1125  E) 1234
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 400= 301 * 3= 
<gadget id="calculator">301 * 3</gadget>
<output>903</output>
903=====&gt; 1092   1092NSWER 1092
<result>A</result>
How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers?