good job on increasing our team sales from 90 to 130 units per day." wow i never thought that we could increase our sales by

The sales was increased by 44.4%.

Step-by-step explanation:

Lets do this cumulative 90 of 10 % = 9 which is 99 90 of 10 % = 9 which is 108 90 of 10% = 9 which is 117 90 of 10% = 9 which is 126 90 of 4 % = 3.6 which is 129.6 90 of 0.044% = 0.0396 which is 129.99 This comes to nearly 44.44 to be closer there was an increase. Always rule 1 approximation use 50% of 90 if it is above 130. Down it to 40% of 90 see if the sales is lower than 130. It should always start with 50,40,30 ... 10 percents. Alternative should be 10,1 or decimals. Approximation using decimals rounding up becomes simple.