A) The number of cows was 100 in 2007 and 200 in 2008. -- As above and below. A) The total costs of the programs wer e $100 for Program A and $200 for Program B.
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AnonymousRegarding the first one, the second option is "the numberS."No, the NUMBER is.
AnonymousRegarding the second one, "the total cost of" is incorrect?
The total cost of ... IS is okay, and the total costs of... ARE is also okay.
It depends if you think of the cost for X + the cost for Y + the cost for Z as one giant