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List formula for a client who wants a level 7 cool tone but has 75-100% grey:
a) 1 oz 7B + 1 oz 7P + 2 oz 20-volume developer
b) 1 oz 7A + 1 oz 7N + 2 oz 30-volume developer
c) 1 oz 7NB + 1 oz 7P + 2 oz 40-volume developer
d) 1 oz 7V + 1 oz 7N + 2 oz 10-volume developer

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