Bellas has 100% / 25% = 4 times less earrings than Monica.
This means that Monica has 10 * 4 = <<10*4=40>>40 earrings.
Rachel has two times fewer earrings than Monica, which means 40 / 2 = <<40/2=20>>20 earrings.
So all three friends, have a total of 10 + 40 + 20 = <<10+40+20=70>>70 earrings.
#### 70