By not knowing how to work this out?

[Luxurybags]

Any maths whizzes on here?

I have 50 units of one thing and 10 units of another thing. The 10 units are 65% more expensive than the 50 units.

I have £50,000 to increase across all 60 units but the cost must be taking into account that the 10 units are more expensive so need a higher increase.

What formula do I need to use?

X is the cost of the 50 unit thing.

50x + 16.5x = 50000

so x = 50000/66.5

then the 10 unit thing is 1.65x.

It comes to £750 and £1240, approximately.

Thank you so much for posting, but I'm still not getting it.
Can you break down your calculations as I make 50 + 16.5 = 66.50 not 50,000 and how do you get to 1.65?
How much is the unit increase for the 10 units?

65% = 0.65
The cost of the higher item is 100% of the other plus another 65%, which is 1.65

So then if x is the amount you’ll increase the lower price by, 1.65x is the amount you’ll raise the higher price by.

The total will be 50 units at x and 10 units at 1.65x. You need the total to be 50000.

Put this in an equation:

50x + 16.5x = 50000

Do algebra

66.5x = 50000

x= 50000/66.5= about 750.

So you increase the lower price by £750.

You increase the higher price by 1.65x which is 1.65 x 750, which is £1240.

Are 10 units of thing 2 65% more than 50 of thing 1?

Surely if second item is 65 % more then it’s the first item that should be multiplied?

Could you post the actual worded problem? There are a few ambiguities in your post.