sentences:  When the local economy's gradual recovery failed to see enrollment return to its previous numbers, the decision was made in 2014 to switch from traditional single-grade classes to the current mixed-age format with grades 1–8 being combined into just four classes that each had students from two grade levels.At the same time tuition was increased by 40% from $7,500 annually to the current rates which average $10,156 per year if a child attends from preschool to eighth grade.Thanks to a $10,000 donation from a student's grandparents in 2017, the school has implemented an energy independence policy and on January 25, 2019 held a ribbon-cutting for a new 15kW solar energy farm on the campus which now provides over 90% of the electricity used by the school.