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# Thread: IPT calculation (calculate a percentage of a figure)

1. ## IPT calculation (calculate a percentage of a figure)

Hi,

I am fairly new to this so please bare with me.

I have a php page that uses Javascript (I think) to calculate the percentage Insurance Premium Tax (IPT field) of a total.

I have located where the calculation occurs and can see that it take the total of a predefined amount and divides it by 21 to give me the 5% IPT tax. IPT has risen in the UK today to 6% so I need to know what I need to change the 21 to to give me an accurate IPT calculation.

Here's a snippet of the code. Can anyone help please? Is it 17.65?

PHP Code:
``` //////////////////////////////////////////// // Motor Bike Calculations //////////////////////////////////////////// \$p = 3; \$q = 0;   while (\$p < 6){   \$base_array = mysql_fetch_row(\$result4);   // Motor Bikes   \$risk_code = 2;   \$ap = (0 + (\$p));           \$ipt_rate = \$ipt_main;   \$monthly_total = \$pricing_row[\$ap];   // Calculate IPT   \$ipt_percentage = \$monthly_total / 21;   \$monthly_ipt = \$ipt_percentage;     \$base_cost = \$base_array[0] + \$dealer_loading;   \$base_final = \$base_cost;      \$profit = \$monthly_total - \$base_cost - \$monthly_ipt;            \$monthly_total = number_format(\$monthly_total, 2, '.', '');             \$monthly_ipt = number_format(\$monthly_ipt, 2, '.', '');                 \$base_final = number_format(\$base_final, 2, '.', '');                     \$profit = number_format(\$profit, 2, '.', '');                        echo '   <tr align="center" bgcolor="#FFDDFF">      <td>'; if (\$p == 3) { echo (''); } elseif (\$p == 4) { echo ('UK'); } elseif (\$p == 5) { echo ('UK & European'); } echo '</td>     <td>         <input name="'; if (\$p == 3) { echo ('comprehensive_plus_'.\$risk_code); } elseif (\$p == 4) { echo ('comprehensive_'.\$risk_code); } elseif (\$p == 5) { echo ('driveline_plus_'.\$risk_code); } echo '" type="text" value="'.\$pricing_row[\$ap].'" size="6" maxlength="6" class="smallinfo">      </td>     <td>'.\$monthly_ipt.'</td>     <td>'.\$base_final.'</td>     <td>'.\$profit.'</td>   </tr>';   \$q++; \$p++; }  ```

• Nope. Not a lick of JavaScript in there. That's 100% PHP code.

But you know, the language in use has nothing to do with this. It's just simple arithmetic.

105 / 21 is indeed 5. Simply because, of course, 105 / 5 is 21.

What you need is to solve for x where 106 / x = 6. And simple algebra says x = 106 / 6 or 17.666666667 (that is 17 and 2/3).

So, you almost had the right answer. Just a shade off. You might want to multiply by 6 and then divide by 106 to get as accurate an answer as possible.

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