Real NNP is
1
\(\frac{{{\rm{NNP\;at\;current\;price}}}}{{{\rm{Price\;index\;of\;current\;year}}}}{\rm{X\;Price\;index\;of\;base\;year}}\)
2
\(\frac{{{\rm{NNP\;at\;current\;price}}}}{{{\rm{Price\;index\;of\;current\;year}}}}\)
3
\(\frac{{{\rm{Price\;index\;of\;current\;year}}}}{{{\rm{NNP\;at\;current\;price}}}}{\rm{X\;Price\;index\;of\;base\;year}}\)
4
\(\frac{{{\rm{Price\;index\;of\;base\;year}}}}{{{\rm{Price\;index\;of\;current\;year}}}}\)