Knowing these numbers

Voucher Value:	$55
Voucher Price:	$27.50
Revenue Share Terms:	60%
Average transaction for vouchers redeemed	$85
COGS	40%
Credit card fees:	2.7%
Operating Fixed Cost	1%
Refunds	1%
Number of vouchers offered	2,000
Number of Vouchers sold:	90%
Number of Vouchers redeemed:	90%

Calculate the rest

Revenue share FOR Groupon
GP per one voucher sold and redeemed
Contribution margin per one voucher sold and redeemed
EBITDA per one voucher sold and redeemed
EBITDA for all vouchers sold and redeemed
EBITDA for all vouchers sold but not redeemed
EBITDA for the total promotion