A municipality is estimating how much water from an average rainfall of $2$ inch is not consumed by local farmland and grassed area in a one day period. A reference crop $($ turf grass$)$ with an evapotranspiration rate of $4$ mm$/$day of water is used for comparision to local crops, which have an average crop coefficient of $1\mathrm{.}15.$ The area of study is $100$ acres, with $40\%$ of the area being cropland and another $30\%$ being turf grass. The amount of rainfall remaining is most nearly? a$)0\mathrm{.}7$ in$,$ b$)1\mathrm{.}3$ in c$)1\mathrm{.}9$ in $,$ d$)2\mathrm{.}3$ in