
Assuming the sum starts at

, the

th partial sum is


As

, you're left with simply 1.
$10.50 gets taken off the original price. I divided $42 by 4 because 25 is 1/4th of 100. This got me $10.50. The original price ($42) minus $10.50 equals $31.50. So the item sells for $31.50!!!!
Answer:
50
Step-by-step explanation:
7+3=10. So imma turn ten into t. 5t=5xt. So 5 times 10. 50.
Hope I helped!