Bentley had $40 in birthday money in her piggy bank. she spent $10 on new flip-flops, then got $20 for her allowance and did not spend any of that money for 1 week. finally, she spent $15 on new sunglasses.

which part of the scenario is best represented by a linear increasing interval?

bentley has $40 in her piggy bank.
bentley spent $10 on new flip flops.
bentley got $20 for her allowance.
bentley spent $15 on sunglasses.