Analysis of active pm

Charles Griffith makes quarterly bets between stocks of industrial and utility sectors. Griffith’s strategy has an annualized active risk of 18%. Based on the information below, If Griffith wants to limit his active risk to 6%, what is the allocation to Utility sector when Griffith is bullish about Industrial stocks?

Benchmark** Weight**

Industrial80%

Utility20%

Answer is -13%…

PLEASE EXPLAIN HOW