Duting 2021, Roberto sold 820 shares of Casual Investor Mutual fund for $8.35 per share. The shares were purchased on the following dates: Required: Calculate the gain (loss) on the sale under the following assumptions: a. Basis is calculated using the first-in, first-out method. Note: Round your intermediate computations and final answer to 2 decimal places. b. Basis is calculated using the average cost method (assume all shares are long-term). Note: Round "Average cost" to 3 decimal places. Round other intermediate computations and final answer to 2 decimal places