Think of the "ex" in index as meaning exponent. Write the prime factorization with exponents. 216 = 23 x 33
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27 x 32 = 1152
52 = 25
U.S. goes by Cetane Number of 40 whereas EU follows a Cetane Index of 46 plus a Cetane Number of 51. Other countries either specify Cetane Number or Cetane index, some of them specify both. Cetane Number can be improved by adding chemical additives , the Cetane Index cannot be influenced since its a quality of base fuel.
The misery index is an index that tries to measure overall happiness in economic terms. It adds the unemploymnet rate to the inflation rate. The higher the number the greater the misery.
1.016 *100 but the "*100" bit is really redundant.