i still cant work out Attributes PRICING please help me!!!!!!!

i have made 1 product but 1 is a single itemwhich is $12 and the second one is bulk but i am trying to work out the second bulk item which is $60
this is what i have but when i press update it shows up as 66 and when i go in and check my site it shows 72.00 in to check out how come it doubles its price have i done something wrong the priceis supose to be 50 not 66 nor 72

Prices and Weights

Price i have in the price part is + 50

Used For
Display Purposes Only:
No
Attribute is Free
**When Product is Free:**Yes

Default Attribute
to be Marked Selected:
No
Apply Discounts Used
by Product Special/Sale:
Yes
Include in Base Price
When Priced by Attributes
Yes
Attribute Required
for Text:
No

i am not sure what to do here

Got a url to this

i have taken it off but i would like to know still how ot do this

Have you read the FAQ's & the wiki?

Do you have a test cart with the demo products loaded?

Could not make any sense from what you posted but I am dense with this