Back to Use proportional relationships to solve multistep ratio and percent problems — Problem 1 · Task Set 5

7.RP.A.3 Tutor Intake -- Multistep Ratio and Percent Problems

This short check helps your tutor see where to start. Work each problem on
your own, without a calculator. If you are not sure, give your best try --
every answer helps your tutor plan your first few sessions.

Grade 7·11 problems·~12 min·Common Core Math - Grade 7·standard·7-rp-a-3

Work through problems with immediate feedback

Concepts

A problem states: "A population of 3,200 increases by 12.5%.
What is the new population?" What type of percent problem is
this, and which relationship models it?

Finding a new value after a percent increase -- new value = original $\times$ (1 + percent/100).

Finding a percent error -- |measured $-$ actual| / actual $\times$ 100.

Finding simple interest -- $I = prt$ .

Finding the original value before a change -- original = new / (1 + percent/100).