If by yield is meant the amount of interest returned plus the amount invested, then the second expression is the correct one. In the expression 0.05 looks like a rate of 5% applied to an amount 0.75. The interest is 0.05*0.75=0.0375. When this is added to the original amount 0.75 we get 0.7875.
Other types of yield are given by the expression 100*(actual yield)/(expected yield) which is a percentage. Neither expression looks like this.
It should be noted that 0.75/0.95=0.75/(1-0.05) which is approximately equal to 0.75(1+0.05)=0.05*0.75+0.75.