The contribution margin per unit is the difference between the selling price and the variable cost per unit, and the contribution margin ratio is the ratio of the contribution margin to the selling price per unit. If the selling price and the variable cost per unit both increase 10 percent and fixed costs do not change, what is the effect on the contribution margin per unit and the contribution margin ratio

On january 1, vermont corporation had 40,000 shares of $10 par value common stock issued and outstanding. all 40,000 shares has been issued in a prior period at $20.00 per share. on february 1, vermont purchased 3,750 shares of treasury stock for $24 per share and later sold the treasury shares for $21 per share on march 1. the journal entry to record the purchase of the treasury shares on february 1 would include a credit to treasury stock for $90,000 debit to treasury stock for $90,000 credit to a gain account for $112,500 debit to a loss account for $112,500