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what, no calculator?
Your question is poorly worded. If you meant to ask
How much money did Jayden make this month and last month?
1365.76+987.63 = 2353.39
If, on the other hand, you meant to ask
How much more money did Jayden make this month than last month?
1365.76-987.63 = 378.13
Math isn't like English. You can't always rely on someone else to figure out what you mean.