Hi there! In order to find the simple interest rate of the bonds, we have to divide the received payment by the bonds invested in them. 504/8,000 is 0.063. This number is in decimal form, but let's multiply by 100 to get the percentage of the number. 0.063 * 100 is 6.3. There. The simple interest rate of the bonds is 6.3%.
Answer:

Step-by-step explanation:
Each shape is 1 whole.
In the given image, there are 4 parts in each shape.
The shaded part in the first shape is 4.
The fraction of the shaded part in the first shape

The shaded part in the second shape is 4.
The fraction of the shaded part in the second shape

The shaded part of the model 

Hence, the fraction represented by the shaded part of the model is
.