Could anybody help me solve these 4 pricing problems attached above?

Consider a firm that produces a durable good whose economic cost price is $100 and life span is 3 years. During that time the product needs supplies that have an economic cost price of $0.50 a month. All consumers are willing to pay at most $50 for the product and $2 per month for supplies. Assuming all buyers will keep on purchasing supplies regularly and the discount rate for the future earning is zero, what pricing strategy should the firm adopt? Consider a firm faced with the following pricing problem. Average economic costs (for production and marketing) are $55 at 20 units and $40 at 40 units. There are 40 consumers per period that are interested in its product. Half of them are fussy and want the product only at the beginning of each period even they have to pay $50 per unit. The other half are price sensitive and would take the product at any time but will pay no more than $30 per unit. At what price should the firm sell its products? Consider two adjacent markets X and Y, of 20 consumers each, where all consumers have a reservation price of $50 for the product and incur a cost of more than $10 for purchasing the product in the adjacent market. A firm operating in market X (The firm gets the government's help in market X) is faced with free competitive entry in market Y and the following cost structure: the economic cost price for the product is $55 at 20 units and $40 at 40 units, with an added cost of $10 per unit to ship the product to the adjacent marker. What pricing strategy should the firm adopt? Consider a firm faced with the following pricing problem. There is free entry and average economic costs are $50 at 20 units and $35 at 40 units. At any volume, it costs the firm an additional $10 per unit to product and market a superior version of the product. Assume that any fixed costs of marketing two products instead of one are negligible. Forty consumers per period are interested in its product. Half of them are price insensitive and want the superior version of the product even if they have to pay $50 per unit. The other half are price sensitive and want the basic version of the product but will pay no more than $30 per unit. In what version and at what price should the firm sell the product