I guess +s have been dropped from the question, so:
100000 + 7000 + 600 + 80 = 107680
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600 + 80 + 4
80% of 100000.00 = 80% * 100000 = 0.8 * 100000 = 80,000.00
80% of 600 = 80% * 600 = 0.8 * 600 = 480
400,000 + 20,000 + 600 + 80 + 2
100,000,000 +200,000 + 50,000 +7000+ 40,000+6000+80+9