Find the compound interest on $20000 in 2years at 4% per annum, the interest being compounded half-yearly?	Choose the correct choice from the following options.
A) $645.56	B) $1648.64	C) $954.26	D) $745.69	E) $1020.45
Principle = $20000   Rate = 2% half yearly = 4 half years   Amount = 20000*(1 + 2/100)^4 = 20000 * 51/50 * 51/50 * 51/50 * 51/50   = $21648.64   C.I. = 21648.64-20000= 
<gadget id="calculator">21648.64-20000</gadget>
<output>1_648.64</output>
$1648.64   Answer is $1648.64
<result>B</result>
Find the compound interest on $20000 in 2years at 4% per annum, the interest being compounded half-yearly?