I’m confused by this ques

I’m confused by this ques

I’m confused by this question on my homework…..According to the concept of the multiplier if the marginal propensity to consume is 0.80 and a rise in the interest rate (increases, decreases)                investment spending by $240, the aggregate demand curve will shift to the (right, left)        by            dollarsIf someone could help explain this to me that would be great.Thank you!

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