$9.$Now, assume that the Thrive Drones startup has worked in accordance with the plan and has reached the milestone, and after $3$ years wants further to extend its business. Yasser and Samer are planning a mid$-$boost to gain market shares and want to expand their business in GCC and internationally. Hence, they are planning to start a second round of investments. According to the new plan, they will need $70,000,000$ for the next $18$ months. Calculate the new percentage of ownership for the founders of Thrive Drones if they secure a new investor who is willing to invest the requested amount for a $15\%$ ownership stake.