两个月之间支付金额的演变

Question

有人可以帮我应用正确的公式来显示两个月之间的支付金额变化吗，例如：

In february :
Paid amounts = 30 Dollars
Turnover = 100 dollars
Evolution of Paid amounts are :  30%


In March :
Paid amounts = 20 Dollars
Turnover = 100 dollars
Evolution of Paid amounts are :  20%

哪个公式对显示MARCH和2月之间的演变是正确的？

(Paid ( March ) - Paid ( February ) ) * 100 / Paid ( February )

或

Percentage ( March ) - Percentage ( Fabruary ) 

谢谢：）