Based on the already discounted price, the amount that Rocco's friend will pay is $189.
First find the discounted price from the $350.
This can be found as:
= 350 x ( 1 - 40%)
= 350 x 60%
= $210
Assuming Rocco's friend gets a further 10% discount, the new price will be:
= 210 x (1 - 10%)
= 210 x 90%
= $189
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