将给定的数字计算成两个给定数字之间的百分比

Question

我试图计算出两个数字之间的百分比，方法是提供应该以百分比为基础的数字(无法在堆栈溢出中找到这个百分比--只有两个数字之间的百分比)。

让我解释一下：

$start_number = 14700
$end_number = 14900


// This is the number to calculate a percentage for
// in this basic example this should come to 50%
$percentage_number = 14800

我知道我需要做什么，但却想不出怎么写：

其中$start_number为0%

$end_number是100%

$percentage_number = X%

Answer 1

$difference = $end_number - $start_number; // 200
$difference_from_start = $end_number - $percentage_number; // 100
$percentage = $difference_from_start / $difference; // 0.5 (50%) 

是你想要的吗？

Answer 2

嗯，这很简单：

$start_number = 14700;
$end_number = 14900;
$percentage_number = 14800;

$result = (($end_number - $percentage_number) * 100) / ($end_number - $start_number);

echo $result;

产出：

50

Answer 3

我认为解决办法是：

百分比= 100 * (percentage_number - start_number) / (end_number - start_number)