Incorrect estimated earnings for lower bound in an upgraded profile

[GeetaSarvadnya]

Description

Found while testing #30351

Incorrect estimated earnings lower bound in an upgraded profile

Steps to Reproduce

1. Clean profile 1.53.100 production env
2. Enable rewrads and select the Cayman Island from the country dropdown
3. View a NTPSI (0.005 BAT)
4. Connected prod uphold account
5. View a regualr ad (0.01)
6. Upgrade the profile to 1.57.x
7. Confirmed that the estimated earnings range is as expected `0.008 - 0.015'
8. View a regular ad in 1.57.x (0.05 BAT)
9. Verify the estimated earnings range on the UI
10. The max bound is as expected 0.065 BAT
11. The lower bound is displayed as 0.048 which is not correct as the lower bound is multiplied by 0.8x for each regular ad and which comes around 0.016 BAT

Actual result:

Example	Example

Expected result:

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.57.18 Chromium: 115.0.5790.98 (Official Build) beta (64-bit)
Revision	d515871a6c6df7d2843e755c8b7dda9b744f26d6
OS	Windows 10 Version 22H2 (Build 19045.3208)

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

cc: @brave/qa-team @Miyayes @zenparsing

[GeetaSarvadnya]

This issue appears in an grandfathered state also:

1. Clean profile 1.47.119 beta build
2. Enable rewards
3. Confirmed that the estimated earnings is 0.000 BAT
4. Upgrade the profile to 1.57.x
5. Estimated earning is displayed as -- Learn more
6. View an Ad
7. Connect a custodian
8. The estimated earnings range is displayed as 0.040 - 0.050 BAT
9. The max bound value is displayed as expected 0.050 BAT
10. The lower bound is 0.040 instead of 0.008

Example	Example

cc: @Miyayes @LaurenWags @zenparsing

[GeetaSarvadnya]

The issue is reproducible on Android also Vivo x70 Pro version 12 running Bravemonoarm64.apk_1.57.19

For detailed steps please refer 1st case in Existing users

cc: @sujitacharya2005 @Miyayes @deeppandya

[GeetaSarvadnya]

Looks like this is expected. I have asked a clarification to @Miyayes to confirm that same.

1st regular ad = 0.01 * 0.8 = 0.008
2nd regular ad= 0.05*0.8 = 0.04, so the lower bound value is (0.008 +0.04 = 0.048)

[GeetaSarvadnya]

The issue works as expected hence closing the issue.