Operation in PHP. Multiplication using percentage

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<?php echo $i['sellingStatus'][0]['currentPrice'][0]['__value__']; ?>

How can I multiply% by% by 2 and then add 60% to the total value?

Example: 

Valor = 10
Multiplica por 2 = 20
Acrescenta 60% = 20 * 60% = 12
Total = 20 + 12 = 32.
    
asked by anonymous 31.03.2014 / 14:20

3 answers

8

Short version: 

<?php echo $i['sellingStatus'][0]['currentPrice'][0]['__value__'] * 3.2 ;>

Explanation:

Calculating an increase of 60% is the same as multiplying by 1.6. After all 100% = 1, therefore 60% = 0.6. As we want to add, we want 100% + 60%, ie multiplying by (1 + 0.6) = > (1.6)

If you want to multiply by 2 and then add 60%, it would be equivalent to 

valor * 2 * 1.6

Simplifying 

valor * 3.2

Long version:

If you want to use the formula in several items with different percentages, then the thing changes. You could use a function for this: 

$indice = 2; // Acrescentado com base no comment, que vai ser o índice do dólar.
echo acrescimo( $i['sellingStatus'][0]['currentPrice'][0]['__value__'] * $indice, 60 );

function acrescimo( $valor, $porcentagem) {
   return $valor * ( 1 + $porcentagem/100 );
}
    
31.03.2014 / 14:29
2

Try this way, following the formula to find out the percentage is: (numero1/100) * a porcentagem que você quer descobrir 

    valor = 10;
    multiplicado = 10*2;
    porcentagem = (multiplicado/100)*60;
    total = multiplicado+porcentagem;
    
31.03.2014 / 14:25
1

I will only complement the previous answers, since both are very accurate: 

<?php
function acrescenta($valor, $percentual){
    return($valor * ( 1 + ($percentual / 100)));
}
?>

You use this (assuming the original value is 50): 

<?php
$total = $total * 2;
$total = acrescenta(50, 60);
?>
    
31.03.2014 / 15:05
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