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<?php
if (!function_exists('calculateTax')) {
function calculateTax($price, $taxRate, $isInclusive = true)
{
$taxRate = $taxRate / 100; // Convert percentage to decimal
if ($isInclusive) {
// Calculate price exclusive of tax
$exclusivePrice = $price / (1 + $taxRate);
$taxAmount = $price - $exclusivePrice;
$inclusivePrice = $price;
} else {
// Calculate price inclusive of tax
$exclusivePrice = $price;
$taxAmount = $price * $taxRate;
$inclusivePrice = $price + $taxAmount;
}
return [
'exclusive_price' => round($exclusivePrice, 2),
'inclusive_price' => round($inclusivePrice, 2),
'tax_amount' => round($taxAmount, 2)
];
}
}
if (!function_exists('calculatePrice')) {
function calculatePrice($price, $taxRate, $needInclusive = true)
{
$taxArray = calculateTax($price, $taxRate, $needInclusive);
return $needInclusive ? $taxArray['exclusive_price'] : $taxArray['inclusive_price'];
}
}
if (!function_exists('calculateProfitMargin')) {
// Function to calculate profit margin given the sale price
function calculateProfitMargin($purchasePrice, $salePrice, $taxRate, $taxType) {
// Handle edge cases
if ($purchasePrice == 0 || $salePrice == 0) {
return 0; // Return 0% profit margin if purchase or sale price is 0
}
if ($taxType === 'Inclusive') {
// Calculate base price (excluding tax) from inclusive purchase price
$base_price = calculatePrice($purchasePrice, $taxRate, true);
// Calculate sale price excluding tax from inclusive sale price
$sale_excl = calculatePrice($salePrice, $taxRate, true);
// Compute profit margin
$profit_margin = ($sale_excl / $base_price) - 1;
} else {
// Calculate sale price excluding tax (assuming salePrice is inclusive)
$sale_excl = calculatePrice($salePrice, $taxRate, true);
// Compute profit margin based on purchase price (exclusive)
$profit_margin = ($sale_excl / $purchasePrice) - 1;
}
// Convert profit margin to percentage and round
$profit_margin_percent = round($profit_margin * 100, 2);
return $profit_margin_percent;
}
}
if (!function_exists('calculateSalePrice')) {
// Function to calculate sale price given the profit margin
function calculateSalePrice($purchasePrice, $profitMargin, $taxRate, $taxType) {
// Handle edge cases
if ($purchasePrice == 0) {
return 0; // Return 0 if purchase price is 0
}
$profitMargin_decimal = $profitMargin / 100;
if ($taxType === 'Inclusive') {
// Convert inclusive purchase price to exclusive
$base_price = calculatePrice($purchasePrice, $taxRate, true);
// Apply profit margin to base price
$price_after_profit = $base_price * (1 + $profitMargin_decimal);
// Convert to inclusive sale price
$sale_price = calculatePrice($price_after_profit, $taxRate, false);
} else {
// Apply profit margin to purchase price (exclusive)
$price_after_profit = $purchasePrice * (1 + $profitMargin_decimal);
// Convert to inclusive sale price
$sale_price = calculatePrice($price_after_profit, $taxRate, false);
}
// Round the sale price to 2 decimal places
return round($sale_price, 2);
}
}