HELP ME PLEASE!!!!

Mathematics

1 answer:

sergejj [24]3 years ago

8 0

$100\%+5\%=105\%=1.05\\\\\#0-40\\\#1-40\cdot1.05=42\\\#2-40\cdot1.05\cdot1.05=40\cdot1.05^2=44.1\\\#3-40\cdot1.05\cdot1.05\cdot1.05=40\cdot1.05^3=46.305\\\vdots\\\text{therefore}\\\#12-40\cdot1.05^{12}\approx71.834\approx72\\\\\text{Answer:}\ 72$

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