21. A restaurant has an average check of $16. Its monthly sales revenue is $800,000, variable costs is $240,000 and fixed costs of $350,000. (a) What is the breakeven sales revenue? (b) What is the breakeven sales unit? (c) If actual sales revenue was $480,000, what would the restaurant's income be? (d) If actual sales revenue was $480,000, how many fewer customers per month would be served than at the forecasted sales level of $800,000? (average check remains at $16). (e) If price is increased to $20 (variable cost remains same as before), what would be the breakeven sales revenue and breakeven sales unit