What's the blended transaction fee rate, using the Lehman formula, with the transaction value intervals of $100MM = 2%, and the total transaction cost of

What's the blended transaction fee rate, using the Lehman formula, with the transaction value intervals of <$30MM = 5%, $30MM - $50MM = 4%, $50MM - $100MM = 3%, & >$100MM = 2%, and the total transaction cost of $150MM ?

a.3.6%

b.4.0%

c.3.9%

d.3.2%