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contracts...RTOToken.sol

pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v3.0.0/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v3.0.0/contracts/math/SafeMath.sol";
import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";

contract RTOToken is ERC20 {
    using SafeMath for uint256;
    
	address public deployer;
    AggregatorV3Interface internal priceFeed;
    
    uint16 public RTO_EARNINGS_PERCENT = 30;
    
	mapping (address => bool) public Landlords;
	
	event TokensMinted(
	    address earner,
	    uint256 amount
	);
	
	
	constructor() ERC20("RentToOwn", "RTO") public {
        deployer = msg.sender;
        priceFeed = AggregatorV3Interface(0x4a504064996F695dD8ADd2452645046289c4811C);
        
    }
	
	function addLandlord(address _landlord) public {
	    require(msg.sender == deployer, "Only admin can call this function.");
	    Landlords[_landlord] = true;
	}


    /**
     * Returns the latest price
     */
    function getThePrice() public view returns (uint256) {
        (
            uint80 roundID, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        
        return uint256(price).div(1e8); // price that we get is USD*1e8 / ETH
    }
    
    function payRent(address payable _to) public payable {
        require(Landlords[_to] == true, "Rent must be sent to an approved landlord.");
        
        _to.transfer(msg.value);

        uint256 amountToMint = msg.value.mul(uint256(getThePrice())).mul(RTO_EARNINGS_PERCENT).div(100);
        _mint(msg.sender, amountToMint);
        emit TokensMinted(msg.sender, amountToMint);
    }
}