Please answer the followings:

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

Voucher Value:	$50
Voucher Price:	$25
Revenue Share Terms:	50%
Average transaction for vouchers redeemed	$85
COGS	60%
Credit card fees:	3%
Operating Fixed Cost	2%
Refunds	3%
Number of vouchers offered	100
Number of Vouchers sold:	80%
Number of Vouchers redeemed:	90%