Calculator.php

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<?php
namespace Magento\Framework\Math;

class Calculator
{
    protected $_delta = 0.0;

    protected $priceCurrency;

    public function __construct(\Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency)
    {
        $this->priceCurrency = $priceCurrency;
    }

    public function deltaRound($price, $negative = false)
    {
        $roundedPrice = $price;
        if ($roundedPrice) {
            if ($negative) {
                $this->_delta = -$this->_delta;
            }
            $price += $this->_delta;
            $roundedPrice = $this->priceCurrency->round($price);
            $this->_delta = $price - $roundedPrice;
            if ($negative) {
                $this->_delta = -$this->_delta;
            }
        }
        return $roundedPrice;
    }
}