Respuesta :

With Calculator

41.8 = 100%
215%/100% = 2.15
41.8 x 2.15 = 89.87

Without Calculator

41.8 = 100%

x2
83.6 = 200%

/10
4.18 = 10%

/20
2.09 = 5%

200 + 10 + 5 = 215%
83.6 + 4.18 +2.09 = 89.87