If this is the answer, there does not apply a double for business.

MILES
(TPM): 1-500
Economy
Reduced: 100
Economy
Complete: 150
Business: 200

In this case it works out like:
20500-4200=16300miles/100=163*25=4075points * 2 (because of business) = 8150points + 4200points = 12350 pionts

>10k = GOLD.

So if this is the calculation it would be *G.

What do you think?!?!?

Markus