pragma solidity ^0.5.0;

library FeesLibrary {

    // this calculates fee of 10% of the original amount
    function calcFees(uint256 amount) public view returns (uint256) {
        uint256 Fees = amount * 10 / 100;
        return Fees;
    }

    function lessFees(uint256 amount) public view returns (uint256) {
        return amount - calcFees(amount);
    }


}

contract FoodDelivery {

    function calcFees(uint256 amount) public view returns (uint256) {
        return FeesLibrary.calcFees(amount);
    }

    function lessFees(uint256 amount) public view returns (uint256) {
        return FeesLibrary.lessFees(amount);
    }

    function Pay(address payable seller, address payable delivery, uint256 amount) public {
        seller.transfer(lessFees(amount));
        delivery.transfer(calcFees(amount));
    }
}

contract RentalPayment {

    function calcFees(uint256 amount) public view returns (uint256) {
        return FeesLibrary.calcFees(amount);
    }

    function lessFees(uint256 amount) public view returns (uint256) {
        return FeesLibrary.lessFees(amount);
    }

    function PayRent(address payable landlord, address payable broker, uint256 amount) public {
        landlord.transfer(lessFees(amount));
        broker.transfer(calcFees(amount));
    }
}