please solve

You work for Pistol Pete Natural Gas Co and there is 30 MMBtu worth of natural gas reserves available to use across both period 0 and period 1. Marginal cost of extracting the natural gas is zero. Market Demand is Q = 30 2P Also the current interest rate is 20%. Using the equimarginal principle. what quantity will be sold in the market in period 0? Round your final answer to the nearest single decimal place lie. X.X). $10