Minimax regret table

Sir I am new here and I need your help on this. Please answer

Minimax (regret table):
Best option from Worst Outcomes

[If demand is in Column; and Contract is in Rows;]

Demand—-Probability————-Contract
———————————300—–500——700——800
400————–0.2——–2900—-3500—-4100—-4400
500————–0.3——–3400—-4000—-4600—-4400
700————–0.4——–4400—-5000—-4600—-4400
900————–0.1——–5400—-5000—-4600—-4400

Demand—Probability————-Contract
———————————300—–500—–700—–800
400————-0.2———2500—-1500—-500——-0
500————-0.3———2000—-1000——0——–0
700————-0.4———1000——-0——–0——–0
900————-0.1————0———0——–0——–0

Best Outcomes:
300 units = $2500
500 units = $1500
700 units = $500 (Worst Option)
800 units = $0

Sign contract for 700 units;

It doesn’t matter whether we make regret table based on rows or columns (both result in the same answer).