Self-help math problem for being stuck:
Loss of 10% and increase of 11% to recover the cost
Loss of 20% and increase of 25% to recover the cost
Loss of 30% and increase of 42.86% to recover the cost
Loss of 40% and increase of 66.67% to recover the cost
Loss of 50% and increase of 100% to recover the cost
Loss of 60% and increase of 150% to recover the cost
Loss of 70% and increase of 233.33% to recover the cost
Loss of 80% and increase of 400% to recover the cost