You Used The Same Method I Used In My First Post Just A Diffrent Approach In Math :
https://steemit.com/money/@steemian69/purchasing-dash-x11-mining-contracts-roi-calculation-included
Also Check My Post To Know How To Get The Most Out Of Genesis Mining Contracts :
https://steemit.com/bitcoin/@steemian69/genesis-mining-investment-oppertunity-roi-calculation-included