Answer the following question based on the information given below.
The figures below present annual growth rate, expressed as the $\%$ change relative to the previous year, in four sectors of the economy of the Republic of Reposia during the $9$ year period from $1990$ to $1998.$ Assume that the index of production for each of the four sectors is set at $100$ in $1989.$ Further, the four sectors manufacturing, mining and quarrying, electricity, and chemicals, respectively, constituted $20\%, 15\%, 10\%$ and $15\%$ of total industrial production in $1989.$
The overall growth rate in $1991$ of the four sectors together is approximately
- $10\%$
- $1\%$
- $2.5\%$
- $1.5\%$