A builder lays bricks in horizontal layers to form a stepped structure

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

A builder lays bricks in horizontal layers to form a stepped structure. The first (lowest) layer has 100 bricks and every layer above it has 4 fewer bricks than the layer just below. How many bricks are there in the 22nd layer?

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