There are 5 significant digits in number 14500. To count for a given number as to how many significant digits does it have, look for the first zero form left and decimal point.
For ex sample 0045 has 2 significant digits
0.0045 has 2 significant digits
0.4500 has 4 significant digits.
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100,000 milligrams = 1 hectogram so 14500 mg = 14500/100000 = 0.145 Hg. Simple!
14500
The interest is 5 X 0.09 X 14500 = 6525.
B = (4100x4100) - (14500x14500)
% rate= 1.45 * 100%= 145%