After adding 4 pennies,
Total in cash register is: 4 pennies.

After adding 3 nickels,
Total in cash register is: 19 pennies.

After adding 4 dimes,
Total in cash register is: 59 pennies.

After removing 13 pennies,
Total in cash register is: 46 pennies.

After adding 3 quarters,
Total in cash register is: 121 pennies.

After adding 7 ones,
Total in cash register is: 821 pennies.

After removing 5 quarters,
Total in cash register is: 696 pennies.

After adding 2 fives,
Total in cash register is: 1696 pennies.

After adding 6 tens,
Total in cash register is: 7696 pennies.

After adding 7 twenties,
Total in cash register is: 21696 pennies.