Answer and Explanation:
The computation of the amount of the LIFO reserve and the LIFO effect related to 2020 is shown below:
Internal reporting inventory $2,688,300
Less: External reporting inventory $1,525,000
LIFO reserve at December 31 2020 $1,163,300
Less: Beginning LIFO credit reserve $1,067,300
LIFO effect for 2020 $96,000