effectiveGasPrice is not available in transactionReceipt object.

[ghost]

In the course, Patrick multiplied gasUsed with effectiveGasPrice but when we do same with him using .mul() function, it returns .mul() is not a function and I think it is a because of we are using newer version of dependencies but as he said in course, we can use a * b or a + b too instead using these functions. Okay, but how we can multiply gasUsed to effectiveGasPrice if transactionReceipt doesn't include it ? I have multiplied gasUsed to gasPrice instead effectiveGasPrice... but i have no idea is it right or not.

FundMe.test.js: https://gist.github.com/abdulazizkhf123/5b53aff1b59c52ed6af00d74f8d9d3d7

[ghost]

Prior to EIP-1559 or on chains that do not support it, this value will simply be equal to the transaction gasPrice.