Please help! Please show formulas as well!

The postal service of St. Vincent, an island in the West Indies, obtains a significant portion of its revenues from sales of special souvenir sheets to stamp collectors. The souvenir sheets usually contain several high- value St. Vincent stamps depicting a common theme, such as the life of Princess Diana. The souvenir sheets are designed and printed for the postal service by Imperial Printing, a stamp agency service company in the United Kingdom. The souvenir sheets cost the postal service $1.55 each. St. Vincent has been selling these souvenir sheets for $10.00 each and ordinarily sells about 68,000 units. To test the market, the postal service recently priced a new souvenir sheet at $11.00 and sales dropped to 58,000 units. Required: 1a. Calculate the contribution margin for sale price of $10.00 each or $11.00 each? $10.00 Price $11.00 Price Unit sales Sales Cost of goods sold Contribution margin 1b.Does the postal service of St. Vincent make more money selling souvenir sheets for $10.00 each or $11.00 each? $10.00 O $11.00 2. Estimate the price elasticity of demand for the souvenir sheets. (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Round your answer to 4 decimal places.) Price elasticity of demand 3. Estimate the profit-maximizing price for souvenir sheets. (Do not round intermediate calculations. Round your answer to 2 decimal places.) Profit-maximizing price