Answer:
$75
Step-by-step explanation:
Let, the payment made towards US Speedy credit card be 'U'
Therefore,
According to the question:
Payment made towards Express credit card, E = 3U
Total for the two cards = U + E
= U + 3U
= 4U
also,
Payment made towards passport credit card = 15% of 4U
= 0.15 × 4U
= 0.6U
Given: Total payment made = $575
Therefore,
E + U + 0.6 U = $575
or
3U + U + 0.6U = $575
or
4.6U = $575
or
U = $125
Hence,
Payment made towards passport credit card = 0.6U
= 0.6 × $125
= $75