===== Cost of tasks =====
There is certain amount of credits is spending for each task execution. The cost of task depends on various parameters:
  - values of the primary and secondary task execution time
  - range of  IP in the subnet
  - time of uniqueness of IP
  - setting the permits execution with static IP

The formula for calculating the cost of the task:
<code>S = ((a + b)*T + u*U + r*R)*P*D</code>
//,where//
  * S - the cost of the task
  * a - the time until the click
  * b - the time after the click
  * T - the cost of one second  - 0.0436
  * u - the value of  time uniqueness
  * U - factor of the uniqueness  - 0.02
  * r - size of the subnet of the range
  * R - factor of the size of the subnet of the range  - 0.141
  * P - the factor of the proxy IP  (if the proxy) - 0.5
  * D - factor of dynamic IP  (if IP is dynamic) - 1.05
==== Additionally ====
  * The minimal cost of the task is 4 credits.
  * If the task is script, then the cost of the task calculates similar to the formula. However, the value of time the task will be performed considered according to duration of the script execution.
==== Example ====
  * a = 240
  * b = 60
  * u = 1440
  * r = 4
  * proxy banned
  * static IP Allowed 

results

//for static IP//
<code>S = (240 + 60)*0.0436 + 1440*0.02 + 4*0.141 = 43,164</code>
//for dynamic IP//
<code>S = ((240 + 60)*0.0436 + 1440*0.02 + 4*0.141)*1.05 = 45,3222</code>
//for static proxy IP//
<code>S = ((240 + 60)*0.0436 + 1440*0.02 + 4*0.141)*0.5 = 21,582</code>
//for dynamic proxy IP//
<code>S = ((240 + 60)*0.0436 + 1440*0.02 + 4*0.141)*0.5*1.05 = 22,6611</code>