Risk contributions for two assets

Nifty (σ 16%) and a trend strategy (σ 20%), correlation 0.3, held 50/50. (a) Compute $\Sigma w$, $\sigma(w)$, both $RC_i$ and the percentage contributions. Verify $\sum RC_i = \sigma$. (b) Compute the ERC weights and explain why they do not depend on the correlation.