The Official Guide For GMAT® Quantitative Review, 2ND Edition
What was the amount of money donated to a certain charity?
(1) Of the amount donated, 40 percent came from corporate donations.
(2) Of the amount donated, $1.5 million came from noncorporate donations.
Statement 1) No actual value of money mentioned but the question asks about amount of money. Not Sufficient.
Statement 2) Though the value of money is specified, but the relationship of "noncorporate donations" with the "money donated" is not specified. So Not Sufficient.
Combining the two statements, we know $1.5 million corresponds to 60% (assuming "corporate donations" and "noncorporate donations" are mutually exclusive - Kind of open to interpretation), total money can be calculated. Hence option C)
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