function calcMultiplier() public view returns (uint) {

        if (totalInvested <= 100 ether) {
            return 130;
        } else if (totalInvested <= 250 ether) {
            return 125;
        } else if (totalInvested <= 500 ether) {
            return 120;
        } else if (totalInvested <= 1000 ether) {
            return 110;
        } else {
            return 105;
        }

    }