Hey <achieve_goal>

Following pls find my worked solution:

<1st IF>

C |-----|-----|-----|<---- 85 ---->|

E |-----|

<2nd IF>

C |-|<---------- 597 -------------->|

E |-|-|-|

Since the 1 part (p) of E is divided into 3 equal units (u), the 3 parts (p) of C in <1st IF> is divided likewise. Hence, 3p of C = 9u <1st IF>.

By <Gap & Difference> method and comparing the above 2 models for C, we have ...

9u - 1u = 597 - 85

8u --> 512

1u --> 64

Hence, C = 1u + 597 --> 64 + 597 = **$661**

E = 3u --> 3 × 64 = **$192**

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Trust the above helps.

Do let me know again if this is different from your Answerkey or if there's further clarification.

Cheers,

Edward