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<?php class IssuanceScheme { private $lower_1 = 0; private $upper_1 = 20; private $issuanceFee_1 = '15p'; private $lower_2 = 21; private $upper_2 = 30; private $issuanceFee_2 = '12p'; private $lower_3 = 31; private $upper_3 = null; //50; private $issuanceFee_3 = '10p'; private $lower_4 = null; //51; private $upper_4 = null; //75; private $issuanceFee_4 = null; private $lower_5 = null; //76; // no $upper_5 private $issuanceFee_5 = null; public function calculateIssuanceFee($volume) { $issuanceFee = $this->issuanceFee_1; if ($volume >= $this->lower_1 && ($this->upper_1===null || $volume <= $this->upper_1)) { return $this->issuanceFee_1; } if ($volume >= $this->lower_2 && ($this->upper_2===null || $volume <= $this->upper_2)) { return $this->issuanceFee_2; } if ($volume >= $this->lower_3 && ($this->upper_3===null || $volume <= $this->upper_3)) { return $this->issuanceFee_3; } if ($volume >= $this->lower_4 && ($this->upper_4===null || $volume <= $this->upper_4)) { return $this->issuanceFee_4; } if ($volume >= $this->lower_5) { return $this->issuanceFee_5; } } } $issuanceScheme = new IssuanceScheme; // 15p echo sprintf("Passed in: %s, Exp: %s, Got: %s", 0, '15p', $issuanceScheme->calculateIssuanceFee(0)) . PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 5, '15p', $issuanceScheme->calculateIssuanceFee(5)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 10, '15p', $issuanceScheme->calculateIssuanceFee(10)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 15, '15p', $issuanceScheme->calculateIssuanceFee(15)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 20, '15p', $issuanceScheme->calculateIssuanceFee(20)). PHP_EOL; // 12p echo sprintf("Passed in: %s, Exp: %s, Got: %s", 25, '12p', $issuanceScheme->calculateIssuanceFee(25)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 30, '12p', $issuanceScheme->calculateIssuanceFee(30)). PHP_EOL; // 10p echo sprintf("Passed in: %s, Exp: %s, Got: %s", 50, '10p', $issuanceScheme->calculateIssuanceFee(50)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 60, '10p', $issuanceScheme->calculateIssuanceFee(60)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 75, '10p', $issuanceScheme->calculateIssuanceFee(75)). PHP_EOL; echo sprintf("Passed in: %s, Exp: %s, Got: %s", 100, '10p', $issuanceScheme->calculateIssuanceFee(100)). PHP_EOL;