9.4+9.4-2.25+2.2-5.9+86.10+12.98-62.6
1 answer:
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Answer:
C.
Step-by-step explanation:
To find the number of black ribbons one would have subtract the amount of red ribbons from the total number of ribbons. Then one would have to express it as a proportion. Part over whole equals percent over 100. The number of black ribbons over total ribbons equals "b" over 100.